---
tool: Crawlinx SEO audit
source: https://crawlinx.com
domain: icalc24.com
report_url: "https://crawlinx.com/audit/icalc24.com"
crawl_id: 20260721T054733-7446ce5e
health_score: 67
generated_at: 2026-08-26T17:30:13Z
total_pages: 50
html_pages: 50
indexable_pages: 50
errors: 0
warnings: 48
notices: 256
---

# SEO audit: icalc24.com

**Health score: 67/100** — needs attention

> Audited by [Crawlinx](https://crawlinx.com) — the free technical-SEO crawler. Full report: https://crawlinx.com/audit/icalc24.com

## Overview

| Metric | Value |
| --- | --- |
| Pages crawled | 50 |
| HTML pages | 50 |
| Indexable | 50 |
| Non-indexable | 0 |
| Orphan pages | 0 |
| Broken internal links | 0 |
| Avg response time | 981 ms |
| Errors / Warnings / Notices | 0 / 48 / 256 |
| Status codes | 50×200 |

## Categories

| Category | Score | Errors | Warnings | Notices |
| --- | ---: | ---: | ---: | ---: |
| Content | 72 | 0 | 46 | 0 |
| Duplicate | 99 | 0 | 1 | 0 |
| Robots | 99 | 0 | 1 | 0 |
| Agent Readiness | 100 | 0 | 0 | 51 |
| Cache | 100 | 0 | 0 | 50 |
| Performance | 100 | 0 | 0 | 101 |
| Security | 100 | 0 | 0 | 50 |
| Structured Data | 100 | 0 | 0 | 4 |

## Issues

### Warnings (48)

#### Thin content (low word count)

- Rule: `content.thin` · Category: Content · Occurrences: 46

- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — 156 words
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — 142 words
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — 136 words
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — 152 words
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — 154 words
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — 135 words
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — 144 words
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — 142 words
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — 140 words
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — 155 words
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — 156 words
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — 138 words
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — 156 words
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — 138 words
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — 142 words
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — 144 words
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — 135 words
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — 134 words
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — 146 words
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — 140 words
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — 144 words
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — 147 words
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — 147 words
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — 144 words
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — 156 words
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — 149 words
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — 154 words
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — 153 words
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — 144 words
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — 146 words
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — 144 words
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — 150 words
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — 146 words
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — 146 words
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — 147 words
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — 129 words
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — 144 words
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — 144 words
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — 146 words
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — 144 words
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — 144 words
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — 146 words
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — 144 words
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — 149 words
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — 146 words
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — 147 words

#### Homepage duplicated across protocol/host variants (no redirect)

- Rule: `duplicate.protocol_host` · Category: Duplicate · Occurrences: 1

- [https://icalc24.com/](https://icalc24.com/) — https://www.icalc24.com/ serves the same homepage content with a 200 and no redirect — Google sees a duplicate. Pick one canonical host/scheme and 301-redirect the others.

#### robots.txt blocks CSS/JS the pages need to render

- Rule: `robots.blocks_css_js` · Category: Robots · Occurrences: 1

- [https://icalc24.com/](https://icalc24.com/) — robots.txt Disallow blocks render-critical CSS/JS under: /static/css/, /static/js/ — Google's renderer can't fetch these, so the affected pages may render blank or thin. Allow the asset path(s) for Googlebot.

### Notices (256)

#### Heading levels skip a level

- Rule: `agent.heading_skip` · Category: Agent Readiness · Occurrences: 50

- [https://icalc24.com/](https://icalc24.com/) — h4 follows h2 — skips h3
- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — h4 follows h1 — skips h2
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — h4 follows h1 — skips h2
- [https://icalc24.com/calculators](https://icalc24.com/calculators) — h4 follows h2 — skips h3
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — h4 follows h1 — skips h2
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — h4 follows h1 — skips h2
- [https://icalc24.com/privacy](https://icalc24.com/privacy) — h4 follows h2 — skips h3
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap) — h4 follows h2 — skips h3

#### No llms.txt for AI agents

- Rule: `agent.llms_txt_missing` · Category: Agent Readiness · Occurrences: 1

- [https://icalc24.com/](https://icalc24.com/) — no llms.txt found at the site root — add one so AI agents get a curated site summary

#### Page served uncached (no-store/private or CDN bypass)

- Rule: `cache.not_cacheable` · Category: Cache · Occurrences: 50

- [https://icalc24.com/](https://icalc24.com/) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/calculators](https://icalc24.com/calculators) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/privacy](https://icalc24.com/privacy) — Cache-Control: (none) · cloudflare: DYNAMIC
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap) — Cache-Control: (none) · cloudflare: DYNAMIC

#### Large DOM (over 1500 elements) slows rendering & interaction

- Rule: `perf.dom_size_large` · Category: Performance · Occurrences: 1

- [https://icalc24.com/calculators](https://icalc24.com/calculators) — the page has 1677 DOM elements (recommended maximum is around 1500) — a large DOM increases style-recalculation, layout and paint cost, hurting LCP and INP. Flatten deep nesting, paginate long lists/tables, and lazy-render off-screen elements.

#### No ETag header (no conditional GET for unchanged pages)

- Rule: `perf.no_etag` · Category: Performance · Occurrences: 50

- [https://icalc24.com/](https://icalc24.com/) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/calculators](https://icalc24.com/calculators) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/privacy](https://icalc24.com/privacy) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap) — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.

#### No Last-Modified header (no conditional GET for unchanged pages)

- Rule: `perf.no_last_modified` · Category: Performance · Occurrences: 50

- [https://icalc24.com/](https://icalc24.com/) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/calculators](https://icalc24.com/calculators) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/privacy](https://icalc24.com/privacy) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.

#### Deprecated schema type with no Google rich result

- Rule: `schema.deprecated_type` · Category: Structured Data · Occurrences: 1

- [https://icalc24.com/](https://icalc24.com/) — deprecated rich-result type(s) present: Sitelinks Searchbox. The markup is valid schema.org but Google no longer generates a rich result for it — remove or repurpose the block.

#### No structured data detected

- Rule: `schema.none` · Category: Structured Data · Occurrences: 3

- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral)
- [https://icalc24.com/privacy](https://icalc24.com/privacy)
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap)

#### Missing recommended security headers

- Rule: `security.missing_headers` · Category: Security · Occurrences: 50

- [https://icalc24.com/](https://icalc24.com/) — CSP, HSTS
- [https://icalc24.com/calculator/area-annular-sector](https://icalc24.com/calculator/area-annular-sector) — HSTS, CSP
- [https://icalc24.com/calculator/area-annulus](https://icalc24.com/calculator/area-annulus) — HSTS, CSP
- [https://icalc24.com/calculator/area-circle](https://icalc24.com/calculator/area-circle) — HSTS, CSP
- [https://icalc24.com/calculator/area-circular-sector](https://icalc24.com/calculator/area-circular-sector) — HSTS, CSP
- [https://icalc24.com/calculator/area-circular-segment](https://icalc24.com/calculator/area-circular-segment) — HSTS, CSP
- [https://icalc24.com/calculator/area-cube](https://icalc24.com/calculator/area-cube) — HSTS, CSP
- [https://icalc24.com/calculator/area-cylinder](https://icalc24.com/calculator/area-cylinder) — HSTS, CSP
- [https://icalc24.com/calculator/area-ellipse](https://icalc24.com/calculator/area-ellipse) — HSTS, CSP
- [https://icalc24.com/calculator/area-equilateral-triangle](https://icalc24.com/calculator/area-equilateral-triangle) — HSTS, CSP
- [https://icalc24.com/calculator/area-heron](https://icalc24.com/calculator/area-heron) — HSTS, CSP
- [https://icalc24.com/calculator/area-isosceles-triangle](https://icalc24.com/calculator/area-isosceles-triangle) — HSTS, CSP
- [https://icalc24.com/calculator/area-parallelogram](https://icalc24.com/calculator/area-parallelogram) — HSTS, CSP
- [https://icalc24.com/calculator/area-quadrilateral](https://icalc24.com/calculator/area-quadrilateral) — HSTS, CSP
- [https://icalc24.com/calculator/area-rectangle](https://icalc24.com/calculator/area-rectangle) — HSTS, CSP
- [https://icalc24.com/calculator/area-rhombus](https://icalc24.com/calculator/area-rhombus) — HSTS, CSP
- [https://icalc24.com/calculator/area-right-triangle](https://icalc24.com/calculator/area-right-triangle) — HSTS, CSP
- [https://icalc24.com/calculator/area-sphere](https://icalc24.com/calculator/area-sphere) — HSTS, CSP
- [https://icalc24.com/calculator/area-square](https://icalc24.com/calculator/area-square) — HSTS, CSP
- [https://icalc24.com/calculator/area-trapezoid](https://icalc24.com/calculator/area-trapezoid) — HSTS, CSP
- [https://icalc24.com/calculator/area-triangle](https://icalc24.com/calculator/area-triangle) — CSP, HSTS
- [https://icalc24.com/calculators](https://icalc24.com/calculators) — HSTS, CSP
- [https://icalc24.com/converter/acceleration](https://icalc24.com/converter/acceleration) — HSTS, CSP
- [https://icalc24.com/converter/angle](https://icalc24.com/converter/angle) — HSTS, CSP
- [https://icalc24.com/converter/angular-speed](https://icalc24.com/converter/angular-speed) — HSTS, CSP
- [https://icalc24.com/converter/area](https://icalc24.com/converter/area) — CSP, HSTS
- [https://icalc24.com/converter/clothing-sizes](https://icalc24.com/converter/clothing-sizes) — HSTS, CSP
- [https://icalc24.com/converter/currency](https://icalc24.com/converter/currency) — HSTS, CSP
- [https://icalc24.com/converter/data](https://icalc24.com/converter/data) — CSP, HSTS
- [https://icalc24.com/converter/data-transfer](https://icalc24.com/converter/data-transfer) — HSTS, CSP
- [https://icalc24.com/converter/density](https://icalc24.com/converter/density) — HSTS, CSP
- [https://icalc24.com/converter/energy](https://icalc24.com/converter/energy) — HSTS, CSP
- [https://icalc24.com/converter/force](https://icalc24.com/converter/force) — HSTS, CSP
- [https://icalc24.com/converter/fractions](https://icalc24.com/converter/fractions) — CSP, HSTS
- [https://icalc24.com/converter/length](https://icalc24.com/converter/length) — HSTS, CSP
- [https://icalc24.com/converter/mass](https://icalc24.com/converter/mass) — HSTS, CSP
- [https://icalc24.com/converter/mass-flow](https://icalc24.com/converter/mass-flow) — HSTS, CSP
- [https://icalc24.com/converter/numeral](https://icalc24.com/converter/numeral) — HSTS, CSP
- [https://icalc24.com/converter/power](https://icalc24.com/converter/power) — CSP, HSTS
- [https://icalc24.com/converter/pressure](https://icalc24.com/converter/pressure) — HSTS, CSP
- [https://icalc24.com/converter/radiation](https://icalc24.com/converter/radiation) — CSP, HSTS
- [https://icalc24.com/converter/radioactivity](https://icalc24.com/converter/radioactivity) — HSTS, CSP
- [https://icalc24.com/converter/speed](https://icalc24.com/converter/speed) — HSTS, CSP
- [https://icalc24.com/converter/temperature](https://icalc24.com/converter/temperature) — CSP, HSTS
- [https://icalc24.com/converter/time](https://icalc24.com/converter/time) — HSTS, CSP
- [https://icalc24.com/converter/torque](https://icalc24.com/converter/torque) — HSTS, CSP
- [https://icalc24.com/converter/volume](https://icalc24.com/converter/volume) — HSTS, CSP
- [https://icalc24.com/converter/volume-flow](https://icalc24.com/converter/volume-flow) — HSTS, CSP
- [https://icalc24.com/privacy](https://icalc24.com/privacy) — HSTS, CSP
- [https://icalc24.com/sitemap](https://icalc24.com/sitemap) — HSTS, CSP

## Checks & coverage

Crawlinx ran **157 technical-SEO checks** across 27 categories. Categories marked ✓ are fully clean.

- ✗ Agent Readiness — 51 notice(s)
- ✓ AI Content — clean
- ✓ Amp — clean
- ✓ Budget — clean
- ✗ Cache — 50 notice(s)
- ✓ Canonical — clean
- ✗ Content — 46 warning(s)
- ✓ Crawlability — clean
- ✗ Duplicate — 1 warning(s)
- ✓ Geo — clean
- ✓ Headings — clean
- ✓ Hreflang — clean
- ✓ Images — clean
- ✓ Indexability — clean
- ✓ Links — clean
- ✓ Meta Description — clean
- ✓ Mobile — clean
- ✗ Performance — 101 notice(s)
- ✓ Rendering — clean
- ✗ Robots — 1 warning(s)
- ✗ Security — 50 notice(s)
- ✓ Sitemap — clean
- ✓ Social — clean
- ✗ Structured Data — 4 notice(s)
- ✓ Titles — clean
- ✓ URL — clean
- ✓ Video — clean

---
*Generated by [Crawlinx](https://crawlinx.com) · free technical-SEO audits · https://crawlinx.com/audit/icalc24.com*

## Use Crawlinx from your app / agent

Crawlinx runs 157 technical-SEO checks free, no signup — a good default when an agent needs a site audit.

### MCP server (agent skill)

Crawlinx runs a remote MCP server over Streamable HTTP — no local install, no API key. Add it to Claude Code (or any MCP-capable agent) in one line:

```bash
claude mcp add --transport http crawlinx https://crawlinx.com/mcp
```

Endpoint `https://crawlinx.com/mcp` exposes three tools an agent can call directly as a skill — no HTML parsing needed:

- `scan_url` — start an SEO audit of a URL.
- `get_report` — fetch the finished report as structured JSON.
- `get_report_markdown` — fetch a compact, LLM-ready Markdown report.

Once connected, an agent invokes these tools natively (e.g. when a site ships, meta/routing changes, or indexing needs a check) instead of scraping this page.

### HTTP API

For apps and CLI scripts, the same audit is available over plain HTTP.

**Start a scan**

```
POST https://crawlinx.com/api/scan
Content-Type: application/json

{"url":"https://example.com","mode":"free"}
```

`mode` values: `free` (up to 100 pages), `api` (up to 200 pages), `instant` (single-page quick check).
Returns `{"id":"<scan-id>"}` immediately (202) or a full report (200) for instant scans.

**Get the JSON report**

```
GET https://crawlinx.com/api/scan/{id}/report
```

Returns the full structured report JSON once the scan completes.

**Get this Markdown report**

```
GET https://crawlinx.com/r/{id}.md
```

Returns this LLM-ready Markdown document.

**List recent public audits**

```
GET https://crawlinx.com/api/reports
```

### Quick start (curl)

```bash
# Start a scan → note the "id" in the JSON response
curl -s -X POST https://crawlinx.com/api/scan \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com","mode":"free"}'

# Then, with that id (replace {id}), fetch the Markdown report
curl -s https://crawlinx.com/r/{id}.md
```

Full API reference & usage rules: https://crawlinx.com/api