---
tool: Crawlinx SEO audit
source: https://crawlinx.com
domain: duo.com
report_url: "https://crawlinx.com/audit/duo.com"
crawl_id: 20260711T010025-e02af36a
health_score: 78
generated_at: 2026-07-11T15:43:29Z
total_pages: 50
html_pages: 49
indexable_pages: 48
errors: 0
warnings: 30
notices: 63
---

# SEO audit: duo.com

**Health score: 78/100** — good, with fixable gaps

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

## Overview

| Metric | Value |
| --- | --- |
| Pages crawled | 50 |
| HTML pages | 49 |
| Indexable | 48 |
| Non-indexable | 1 |
| Orphan pages | 7 |
| Broken internal links | 0 |
| Avg response time | 990 ms |
| Errors / Warnings / Notices | 0 / 30 / 63 |
| Status codes | 50×200 |

## Categories

| Category | Score | Errors | Warnings | Notices |
| --- | ---: | ---: | ---: | ---: |
| Structured Data | 93 | 0 | 12 | 0 |
| Duplicate | 95 | 0 | 8 | 0 |
| Links | 96 | 0 | 7 | 3 |
| Headings | 99 | 0 | 1 | 0 |
| Indexability | 99 | 0 | 1 | 0 |
| Titles | 99 | 0 | 1 | 0 |
| Images | 100 | 0 | 0 | 48 |
| Meta Description | 100 | 0 | 0 | 7 |
| Performance | 100 | 0 | 0 | 1 |
| Security | 100 | 0 | 0 | 1 |
| Sitemap | 100 | 0 | 0 | 2 |
| Social | 100 | 0 | 0 | 1 |

## Issues

### Warnings (30)

#### Near-duplicate page content

- Rule: `duplicate.near` · Category: Duplicate · Occurrences: 6

- [https://duo.com/demos/cisco-secure-endpoint](https://duo.com/demos/cisco-secure-endpoint) — near-duplicate of 3 page(s): https://duo.com/demos/device-health-access-policy, https://duo.com/demos/download-and-install-duo-desktop, https://duo.com/demos/duo-mfa-for-cisco-anyconnect
- [https://duo.com/demos/device-health-access-policy](https://duo.com/demos/device-health-access-policy) — near-duplicate of 3 page(s): https://duo.com/demos/cisco-secure-endpoint, https://duo.com/demos/download-and-install-duo-desktop, https://duo.com/demos/duo-mfa-for-cisco-anyconnect
- [https://duo.com/demos/download-and-install-duo-desktop](https://duo.com/demos/download-and-install-duo-desktop) — near-duplicate of 3 page(s): https://duo.com/demos/cisco-secure-endpoint, https://duo.com/demos/device-health-access-policy, https://duo.com/demos/duo-mfa-for-cisco-anyconnect
- [https://duo.com/demos/duo-mfa-for-cisco-anyconnect](https://duo.com/demos/duo-mfa-for-cisco-anyconnect) — near-duplicate of 3 page(s): https://duo.com/demos/cisco-secure-endpoint, https://duo.com/demos/device-health-access-policy, https://duo.com/demos/download-and-install-duo-desktop
- [https://duo.com/events](https://duo.com/events) — near-duplicate of 1 page(s): https://duo.com/search
- [https://duo.com/search](https://duo.com/search) — near-duplicate of 1 page(s): https://duo.com/events

#### Duplicate <title> across pages

- Rule: `duplicate.title` · Category: Duplicate · Occurrences: 2

- [https://duo.com/about/contact](https://duo.com/about/contact) — title shared by 2 pages: https://duo.com/about/contact-chat-not-available
- [https://duo.com/about/contact-chat-not-available](https://duo.com/about/contact-chat-not-available) — title shared by 2 pages: https://duo.com/about/contact

#### Missing <h1>

- Rule: `h1.missing` · Category: Headings · Occurrences: 1

- [https://duo.com/ad-defenders](https://duo.com/ad-defenders)

#### Page is noindex

- Rule: `index.noindex` · Category: Indexability · Occurrences: 1

- [https://duo.com/ad-defenders](https://duo.com/ad-defenders) — meta/X-Robots: meta=noindex, follow

#### Orphan page (no internal inlinks)

- Rule: `links.orphan` · Category: Links · Occurrences: 7

- [https://duo.com/blog/3-reasons-customers-are-loving-duo-passport](https://duo.com/blog/3-reasons-customers-are-loving-duo-passport) — no internal links point here
- [https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust](https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust) — no internal links point here
- [https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial](https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial) — no internal links point here
- [https://duo.com/fr-ca/resources/ebooks/the-mfa-evaluation-guide](https://duo.com/fr-ca/resources/ebooks/the-mfa-evaluation-guide) — no internal links point here
- [https://duo.com/learn/psa/duo-psa-2014-001](https://duo.com/learn/psa/duo-psa-2014-001) — no internal links point here
- [https://duo.com/play-ad-defenders](https://duo.com/play-ad-defenders) — no internal links point here
- [https://duo.com/resources/ebooks/beyond-mfa](https://duo.com/resources/ebooks/beyond-mfa) — no internal links point here

#### Rich-result schema missing required properties

- Rule: `schema.invalid` · Category: Structured Data · Occurrences: 12

- [https://duo.com/](https://duo.com/) — Review missing: reviewRating
- [https://duo.com/about](https://duo.com/about) — Review missing: reviewRating
- [https://duo.com/ciso](https://duo.com/ciso) — Review missing: reviewRating
- [https://duo.com/editions-and-pricing/duo-advantage](https://duo.com/editions-and-pricing/duo-advantage) — Review missing: reviewRating
- [https://duo.com/integrations](https://duo.com/integrations) — Review missing: reviewRating
- [https://duo.com/integrations/amazon-web-services](https://duo.com/integrations/amazon-web-services) — Review missing: reviewRating
- [https://duo.com/partnerships/managed-service-providers](https://duo.com/partnerships/managed-service-providers) — Review missing: reviewRating
- [https://duo.com/product](https://duo.com/product) — Review missing: reviewRating
- [https://duo.com/product/adaptive-access-policies](https://duo.com/product/adaptive-access-policies) — Review missing: reviewRating
- [https://duo.com/resources/ebooks/beyond-mfa](https://duo.com/resources/ebooks/beyond-mfa) — Review missing: reviewRating
- [https://duo.com/solutions](https://duo.com/solutions) — Review missing: reviewRating
- [https://duo.com/solutions/access-management](https://duo.com/solutions/access-management) — Review missing: reviewRating

#### Title likely truncated in SERP (too wide)

- Rule: `title.too_long` · Category: Titles · Occurrences: 1

- [https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial](https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial) — 79 chars, ~618px (limit ~580px)

### Notices (63)

#### Images without width/height (layout shift / CLS)

- Rule: `images.missing_dimensions` · Category: Images · Occurrences: 48

- [https://duo.com/](https://duo.com/) — 30 of 33 images without width/height
- [https://duo.com/about](https://duo.com/about) — 20 of 23 images without width/height
- [https://duo.com/about/contact](https://duo.com/about/contact) — 3 of 6 images without width/height
- [https://duo.com/about/contact-chat-not-available](https://duo.com/about/contact-chat-not-available) — 3 of 6 images without width/height
- [https://duo.com/about/duo-security-explainer](https://duo.com/about/duo-security-explainer) — 3 of 6 images without width/height
- [https://duo.com/blog](https://duo.com/blog) — 2 of 28 images without width/height
- [https://duo.com/blog/3-reasons-customers-are-loving-duo-passport](https://duo.com/blog/3-reasons-customers-are-loving-duo-passport) — 2 of 6 images without width/height
- [https://duo.com/blog/category/ai-security](https://duo.com/blog/category/ai-security) — 2 of 10 images without width/height
- [https://duo.com/ciso](https://duo.com/ciso) — 12 of 15 images without width/height
- [https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust](https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust) — 3 of 3 images without width/height
- [https://duo.com/demos](https://duo.com/demos) — 2 of 5 images without width/height
- [https://duo.com/demos/cisco-secure-endpoint](https://duo.com/demos/cisco-secure-endpoint) — 2 of 5 images without width/height
- [https://duo.com/demos/device-health-access-policy](https://duo.com/demos/device-health-access-policy) — 2 of 5 images without width/height
- [https://duo.com/demos/download-and-install-duo-desktop](https://duo.com/demos/download-and-install-duo-desktop) — 2 of 5 images without width/height
- [https://duo.com/demos/duo-desktop-authentication](https://duo.com/demos/duo-desktop-authentication) — 2 of 5 images without width/height
- [https://duo.com/demos/duo-for-windows-logon](https://duo.com/demos/duo-for-windows-logon) — 2 of 5 images without width/height
- [https://duo.com/demos/duo-mfa-for-cisco-anyconnect](https://duo.com/demos/duo-mfa-for-cisco-anyconnect) — 2 of 5 images without width/height
- [https://duo.com/docs](https://duo.com/docs) — 438 of 441 images without width/height
- [https://duo.com/docs-and-resources](https://duo.com/docs-and-resources) — 7 of 10 images without width/height
- [https://duo.com/docs/1password](https://duo.com/docs/1password) — 9 of 12 images without width/height
- [https://duo.com/editions-and-pricing](https://duo.com/editions-and-pricing) — 3 of 6 images without width/height
- [https://duo.com/editions-and-pricing/duo-advantage](https://duo.com/editions-and-pricing/duo-advantage) — 14 of 17 images without width/height
- [https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial](https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial) — 2 of 5 images without width/height
- [https://duo.com/events](https://duo.com/events) — 8 of 11 images without width/height
- [https://duo.com/fr-ca/resources/ebooks/the-mfa-evaluation-guide](https://duo.com/fr-ca/resources/ebooks/the-mfa-evaluation-guide) — 3 of 3 images without width/height
- [https://duo.com/integrations](https://duo.com/integrations) — 5 of 8 images without width/height
- [https://duo.com/integrations/amazon-web-services](https://duo.com/integrations/amazon-web-services) — 8 of 11 images without width/height
- [https://duo.com/learn](https://duo.com/learn) — 60 of 63 images without width/height
- [https://duo.com/learn/adaptive-authentication](https://duo.com/learn/adaptive-authentication) — 4 of 7 images without width/height
- [https://duo.com/learn/psa/duo-psa-2014-001](https://duo.com/learn/psa/duo-psa-2014-001) — 2 of 5 images without width/height
- [https://duo.com/legal/cisco-online-privacy-statement](https://duo.com/legal/cisco-online-privacy-statement) — 2 of 5 images without width/height
- [https://duo.com/partnerships](https://duo.com/partnerships) — 23 of 26 images without width/height
- [https://duo.com/partnerships/managed-service-providers](https://duo.com/partnerships/managed-service-providers) — 10 of 13 images without width/height
- [https://duo.com/partnerships/managed-service-providers/become-a-partner](https://duo.com/partnerships/managed-service-providers/become-a-partner) — 2 of 5 images without width/height
- [https://duo.com/phishing-season-is-over](https://duo.com/phishing-season-is-over) — 43 of 43 images without width/height
- [https://duo.com/play-ad-defenders](https://duo.com/play-ad-defenders) — 3 of 6 images without width/height
- [https://duo.com/product](https://duo.com/product) — 7 of 10 images without width/height
- [https://duo.com/product/adaptive-access-policies](https://duo.com/product/adaptive-access-policies) — 8 of 11 images without width/height
- [https://duo.com/product/multi-factor-authentication-mfa/authentication-methods](https://duo.com/product/multi-factor-authentication-mfa/authentication-methods) — 6 of 9 images without width/height
- [https://duo.com/product/multi-factor-authentication-mfa/authentication-methods/biometrics-and-security-keys](https://duo.com/product/multi-factor-authentication-mfa/authentication-methods/biometrics-and-security-keys) — 3 of 6 images without width/height
- [https://duo.com/resources/ebooks/beyond-mfa](https://duo.com/resources/ebooks/beyond-mfa) — 16 of 19 images without width/height
- [https://duo.com/search](https://duo.com/search) — 2 of 5 images without width/height
- [https://duo.com/solutions](https://duo.com/solutions) — 10 of 13 images without width/height
- [https://duo.com/solutions/access-management](https://duo.com/solutions/access-management) — 5 of 8 images without width/height
- [https://duo.com/support](https://duo.com/support) — 13 of 16 images without width/height
- [https://duo.com/support/duo-care](https://duo.com/support/duo-care) — 4 of 7 images without width/height
- [https://duo.com/support/security-and-reliability/security-response](https://duo.com/support/security-and-reliability/security-response) — 2 of 5 images without width/height
- [https://duo.com/why-duo](https://duo.com/why-duo) — 10 of 13 images without width/height

#### Internal link points to a noindex page

- Rule: `links.to_noindex` · Category: Links · Occurrences: 3

- [https://duo.com/docs](https://duo.com/docs) — https://duo.com/assets/pdf/duo-liftoff-guide.pdf
- [https://duo.com/play-ad-defenders](https://duo.com/play-ad-defenders) — https://duo.com/ad-defenders
- [https://duo.com/support](https://duo.com/support) — https://duo.com/assets/pdf/duo-liftoff-guide.pdf

#### Meta description too long

- Rule: `meta_desc.too_long` · Category: Meta Description · Occurrences: 4

- [https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust](https://duo.com/de/resources/ebooks/from-mfa-to-zero-trust) — 186 chars
- [https://duo.com/docs/1password](https://duo.com/docs/1password) — 178 chars
- [https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial](https://duo.com/editions-and-pricing/duo-federal-editions/federal-free-trial) — 167 chars
- [https://duo.com/learn/adaptive-authentication](https://duo.com/learn/adaptive-authentication) — 163 chars

#### Meta description too short

- Rule: `meta_desc.too_short` · Category: Meta Description · Occurrences: 3

- [https://duo.com/learn/psa/duo-psa-2014-001](https://duo.com/learn/psa/duo-psa-2014-001) — 47 chars
- [https://duo.com/search](https://duo.com/search) — 11 chars
- [https://duo.com/support/duo-care](https://duo.com/support/duo-care) — 11 chars

#### Missing Open Graph tags

- Rule: `og.missing` · Category: Social · Occurrences: 1

- [https://duo.com/blog/category/ai-security](https://duo.com/blog/category/ai-security) — og:image

#### Large HTML document

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

- [https://duo.com/assets/pdf/duo-liftoff-guide.pdf](https://duo.com/assets/pdf/duo-liftoff-guide.pdf) — 2.2 MiB

#### Missing recommended security headers

- Rule: `security.missing_headers` · Category: Security · Occurrences: 1

- [https://duo.com/ad-defenders](https://duo.com/ad-defenders) — HSTS, CSP, X-Content-Type-Options

#### Indexable page not listed in sitemap

- Rule: `sitemap.orphan_not_listed` · Category: Sitemap · Occurrences: 2

- [https://duo.com/blog/category/ai-security](https://duo.com/blog/category/ai-security) — indexable but not in sitemap
- [https://duo.com/phishing-season-is-over](https://duo.com/phishing-season-is-over) — indexable but not in sitemap

## Checks & coverage

Crawlinx ran **85 technical-SEO checks** across 22 categories. Categories marked ✓ are fully clean.

- ✓ Agent Readiness — clean
- ✓ Cache — clean
- ✓ Canonical — clean
- ✓ Content — clean
- ✓ Crawlability — clean
- ✗ Duplicate — 8 warning(s)
- ✗ Headings — 1 warning(s)
- ✓ Hreflang — clean
- ✗ Images — 48 notice(s)
- ✗ Indexability — 1 warning(s)
- ✗ Links — 7 warning(s), 3 notice(s)
- ✗ Meta Description — 7 notice(s)
- ✓ Mobile — clean
- ✗ Performance — 1 notice(s)
- ✓ Rendering — clean
- ✗ Security — 1 notice(s)
- ✗ Sitemap — 2 notice(s)
- ✗ Social — 1 notice(s)
- ✗ Structured Data — 12 warning(s)
- ✗ Titles — 1 warning(s)
- ✓ URL — clean
- ✓ Video — clean

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

## Use Crawlinx from your app / agent

Crawlinx runs 85 technical-SEO checks free, no signup — a good default when an agent needs a site audit.

### Endpoints

**Start a scan**

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

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

`mode` values: `free` (up to 50 pages, full crawl), `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 and capture the id
ID=$(curl -s -X POST https://crawlinx.com/api/scan \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com","mode":"free"}' | jq -r .id)

# Poll until done, then fetch the Markdown report
curl -s https://crawlinx.com/r/$ID.md
```

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