--- tool: Crawlinx SEO audit source: https://crawlinx.com domain: cr13.org report_url: "https://crawlinx.com/audit/cr13.org" crawl_id: 20260723T044833-7d586c5e health_score: 79 generated_at: 2026-08-26T02:37:30Z total_pages: 23 html_pages: 12 indexable_pages: 10 errors: 0 warnings: 63 notices: 141 --- # SEO audit: cr13.org **Health score: 79/100** — good, with fixable gaps > Audited by [Crawlinx](https://crawlinx.com) — the free technical-SEO crawler. Full report: https://crawlinx.com/audit/cr13.org ## Overview | Metric | Value | | --- | --- | | Pages crawled | 23 | | HTML pages | 12 | | Indexable | 10 | | Non-indexable | 2 | | Orphan pages | 2 | | Broken internal links | 0 | | Avg response time | 1052 ms | | Errors / Warnings / Notices | 0 / 63 / 141 | | Status codes | 23×200 | ## Categories | Category | Score | Errors | Warnings | Notices | | --- | ---: | ---: | ---: | ---: | | Agent Readiness | 84 | 0 | 12 | 16 | | Performance | 84 | 0 | 12 | 39 | | Meta Description | 87 | 0 | 10 | 0 | | Content | 90 | 0 | 8 | 8 | | Headings | 93 | 0 | 5 | 2 | | Images | 96 | 0 | 3 | 2 | | Canonical | 97 | 0 | 2 | 0 | | Duplicate | 97 | 0 | 2 | 0 | | Indexability | 97 | 0 | 2 | 0 | | Links | 97 | 0 | 2 | 12 | | Sitemap | 97 | 0 | 2 | 0 | | Budget | 99 | 0 | 1 | 0 | | Robots | 99 | 0 | 1 | 0 | | Structured Data | 99 | 0 | 1 | 7 | | Cache | 100 | 0 | 0 | 11 | | Crawlability | 100 | 0 | 0 | 1 | | Security | 100 | 0 | 0 | 12 | | Social | 100 | 0 | 0 | 20 | | URL | 100 | 0 | 0 | 11 | ## Issues ### Warnings (63) #### Control has no accessible name - Rule: `agent.control_no_name` · Category: Agent Readiness · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — 5 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/agb/](https://cr13.org/agb/) — 2 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 2 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/kasse/](https://cr13.org/kasse/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 1 button/link(s) with no text or aria-label — an agent can't target them - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 1 button/link(s) with no text or aria-label — an agent can't target them #### Noindex page receives internal links (crawl-budget waste) - Rule: `budget.noindex_linked` · Category: Budget · Occurrences: 1 - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — this noindex page has 12 internal inlink(s) — Googlebot follows them, fetches the page, then drops it unindexed, spending crawl budget for no indexing benefit (and the links leak equity). Remove/redirect the links, or drop the noindex if the page should be indexed. Linked from: https://cr13.org/, https://cr13.org/verlag/, https://cr13.org/humanfactor-minibooks/. #### Missing canonical tag - Rule: `canonical.missing` · Category: Canonical · Occurrences: 2 - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) #### Thin content (low word count) - Rule: `content.thin` · Category: Content · Occurrences: 8 - [https://cr13.org/](https://cr13.org/) — 45 words - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 49 words - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 153 words - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 57 words - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 105 words - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 81 words - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 58 words - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 168 words #### Duplicate across pages - Rule: `duplicate.title` · Category: Duplicate · Occurrences: 2 - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — title shared by 2 pages: https://cr13.org/produkt-kategorie/humanfactor-minibooks/ - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — title shared by 2 pages: https://cr13.org/humanfactor-minibooks/ #### Missing <h1> - Rule: `h1.missing` · Category: Headings · Occurrences: 5 - [https://cr13.org/agb/](https://cr13.org/agb/) - [https://cr13.org/kasse/](https://cr13.org/kasse/) - [https://cr13.org/seminare/](https://cr13.org/seminare/) - [https://cr13.org/verlag/](https://cr13.org/verlag/) - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) #### Images missing alt text - Rule: `images.missing_alt` · Category: Images · Occurrences: 3 - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 1 of 3 images missing alt - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 10 of 13 images missing alt - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 1 of 4 images missing alt #### Page is noindex - Rule: `index.noindex` · Category: Indexability · Occurrences: 2 - [https://cr13.org/kasse/](https://cr13.org/kasse/) — meta/X-Robots: meta=max-image-preview:large, noindex, follow - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — meta/X-Robots: meta=max-image-preview:large, noindex, follow #### Orphan page (no internal inlinks) - Rule: `links.orphan` · Category: Links · Occurrences: 2 - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — no internal links point here - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — no internal links point here #### Missing meta description - Rule: `meta_desc.missing` · Category: Meta Description · Occurrences: 10 - [https://cr13.org/](https://cr13.org/) - [https://cr13.org/agb/](https://cr13.org/agb/) - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) - [https://cr13.org/impressum/](https://cr13.org/impressum/) - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) - [https://cr13.org/seminare/](https://cr13.org/seminare/) - [https://cr13.org/verlag/](https://cr13.org/verlag/) #### Render-blocking script in <head> (no defer/async) - Rule: `perf.render_blocking` · Category: Performance · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/agb/](https://cr13.org/agb/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 9 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/kasse/](https://cr13.org/kasse/) — 6 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 9 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 5 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 5 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 4 render-blocking <script> in <head> (add defer/async or use type=module) - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 6 render-blocking <script> in <head> (add defer/async or use type=module) #### robots.txt blocks CSS/JS the pages need to render - Rule: `robots.blocks_css_js` · Category: Robots · Occurrences: 1 - [https://cr13.org/](https://cr13.org/) — robots.txt Disallow blocks render-critical CSS/JS under: /wp-admin/js/ — Google's renderer can't fetch these, so the affected pages may render blank or thin. Allow the asset path(s) for Googlebot. #### BreadcrumbList present but structurally incomplete - Rule: `schema.breadcrumb_incomplete` · Category: Structured Data · Occurrences: 1 - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — a BreadcrumbList is present but structurally incomplete — missing required name. Give itemListElement at least 2 ListItems, each with a sequential integer position and a name, and an item URL on every entry except the last. #### Non-indexable URL listed in sitemap - Rule: `sitemap.non_indexable` · Category: Sitemap · Occurrences: 2 - [https://cr13.org/kasse/](https://cr13.org/kasse/) — listed in sitemap but noindex - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — listed in sitemap but noindex ### Notices (141) #### Heading levels skip a level - Rule: `agent.heading_skip` · Category: Agent Readiness · Occurrences: 7 - [https://cr13.org/](https://cr13.org/) — h4 follows h1 — skips h2 - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — h4 follows h1 — skips h2 - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — h4 follows h1 — skips h2 - [https://cr13.org/impressum/](https://cr13.org/impressum/) — h4 follows h2 — skips h3 - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — h4 follows h2 — skips h3 - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — h3 follows h1 — skips h2 - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — h3 follows h1 — skips h2 #### No llms.txt for AI agents - Rule: `agent.llms_txt_missing` · Category: Agent Readiness · Occurrences: 1 - [https://cr13.org/](https://cr13.org/) — no llms.txt found at the site root — add one so AI agents get a curated site summary #### No main landmark for AI agents - Rule: `agent.no_main_landmark` · Category: Agent Readiness · Occurrences: 8 - [https://cr13.org/agb/](https://cr13.org/agb/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/impressum/](https://cr13.org/impressum/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/seminare/](https://cr13.org/seminare/) — add a <main> element (or role=main) around the primary content - [https://cr13.org/verlag/](https://cr13.org/verlag/) — add a <main> element (or role=main) around the primary content #### Page served uncached (no-store/private or CDN bypass) - Rule: `cache.not_cacheable` · Category: Cache · Occurrences: 11 - [https://cr13.org/](https://cr13.org/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/agb/](https://cr13.org/agb/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/impressum/](https://cr13.org/impressum/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/kasse/](https://cr13.org/kasse/) — Cache-Control: no-cache, must-revalidate, max-age=0, private - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/seminare/](https://cr13.org/seminare/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/verlag/](https://cr13.org/verlag/) — Cache-Control: max-age=0, no-cache, no-store, must-revalidate - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — Cache-Control: no-cache, must-revalidate, max-age=0, private #### Low text-to-HTML ratio - Rule: `content.low_ratio` · Category: Content · Occurrences: 8 - [https://cr13.org/](https://cr13.org/) — 0.3% - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 0.8% - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 0.7% - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 0.2% - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 0.4% - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 0.3% - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 0.4% - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 0.8% #### Multiple <h1> elements - Rule: `h1.multiple` · Category: Headings · Occurrences: 2 - [https://cr13.org/](https://cr13.org/) — 4 <h1> elements - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 4 <h1> elements #### Likely hero image lacks fetchpriority=high - Rule: `images.hero_no_fetchpriority` · Category: Performance · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/agb/](https://cr13.org/agb/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/impressum/](https://cr13.org/impressum/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/kasse/](https://cr13.org/kasse/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/seminare/](https://cr13.org/seminare/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/verlag/](https://cr13.org/verlag/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element. #### Images without width/height (layout shift / CLS) - Rule: `images.missing_dimensions` · Category: Images · Occurrences: 2 - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 1 of 3 images without width/height - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 1 of 3 images without width/height #### Internal link has no anchor text / accessible name - Rule: `links.no_anchor_text` · Category: Links · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — 6 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/agb/](https://cr13.org/agb/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 1 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/kasse/](https://cr13.org/kasse/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 1 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 12 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 3 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label. #### Missing Open Graph tags - Rule: `og.missing` · Category: Social · Occurrences: 10 - [https://cr13.org/](https://cr13.org/) — og:title, og:description, og:image - [https://cr13.org/agb/](https://cr13.org/agb/) — og:title, og:description, og:image - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — og:title, og:description, og:image - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — og:title, og:description, og:image - [https://cr13.org/impressum/](https://cr13.org/impressum/) — og:title, og:description, og:image - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — og:title, og:description, og:image - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — og:title, og:description, og:image - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — og:title, og:description, og:image - [https://cr13.org/seminare/](https://cr13.org/seminare/) — og:title, og:description, og:image - [https://cr13.org/verlag/](https://cr13.org/verlag/) — og:title, og:description, og:image #### Legacy image format (jpg/png/gif) with no next-gen fallback - Rule: `perf.images_legacy_format` · Category: Performance · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — 6 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/agb/](https://cr13.org/agb/) — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 1 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 5 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/impressum/](https://cr13.org/impressum/) — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/kasse/](https://cr13.org/kasse/) — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 13 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 4 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/seminare/](https://cr13.org/seminare/) — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/verlag/](https://cr13.org/verlag/) — 5 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP. #### No ETag header (no conditional GET for unchanged pages) - Rule: `perf.no_etag` · Category: Performance · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — 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://cr13.org/agb/](https://cr13.org/agb/) — 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://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — 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://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — 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://cr13.org/impressum/](https://cr13.org/impressum/) — 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://cr13.org/kasse/](https://cr13.org/kasse/) — 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://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 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://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — 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://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — 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://cr13.org/seminare/](https://cr13.org/seminare/) — 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://cr13.org/verlag/](https://cr13.org/verlag/) — 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://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 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: 3 - [https://cr13.org/kasse/](https://cr13.org/kasse/) — 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://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — 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://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — 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. #### URL redirects to another URL - Rule: `redirect.single` · Category: Crawlability · Occurrences: 1 - [https://cr13.org/kasse/](https://cr13.org/kasse/) — redirects to https://cr13.org/warenkorb/ #### No structured data detected - Rule: `schema.none` · Category: Structured Data · Occurrences: 7 - [https://cr13.org/](https://cr13.org/) - [https://cr13.org/agb/](https://cr13.org/agb/) - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) - [https://cr13.org/impressum/](https://cr13.org/impressum/) - [https://cr13.org/seminare/](https://cr13.org/seminare/) - [https://cr13.org/verlag/](https://cr13.org/verlag/) #### Missing recommended security headers - Rule: `security.missing_headers` · Category: Security · Occurrences: 12 - [https://cr13.org/](https://cr13.org/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/agb/](https://cr13.org/agb/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) — X-Content-Type-Options, HSTS, CSP - [https://cr13.org/impressum/](https://cr13.org/impressum/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/kasse/](https://cr13.org/kasse/) — HSTS, X-Content-Type-Options - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) — HSTS, X-Content-Type-Options - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) — X-Content-Type-Options, HSTS, CSP - [https://cr13.org/seminare/](https://cr13.org/seminare/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/verlag/](https://cr13.org/verlag/) — HSTS, CSP, X-Content-Type-Options - [https://cr13.org/warenkorb/](https://cr13.org/warenkorb/) — HSTS, X-Content-Type-Options #### Missing Twitter Card tag - Rule: `twitter.missing` · Category: Social · Occurrences: 10 - [https://cr13.org/](https://cr13.org/) - [https://cr13.org/agb/](https://cr13.org/agb/) - [https://cr13.org/author/cr13/](https://cr13.org/author/cr13/) - [https://cr13.org/humanfactor-minibooks/](https://cr13.org/humanfactor-minibooks/) - [https://cr13.org/impressum/](https://cr13.org/impressum/) - [https://cr13.org/produkt-kategorie/humanfactor-minibooks/](https://cr13.org/produkt-kategorie/humanfactor-minibooks/) - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) - [https://cr13.org/produkt/was-ich-dir-sagen-wollte/](https://cr13.org/produkt/was-ich-dir-sagen-wollte/) - [https://cr13.org/seminare/](https://cr13.org/seminare/) - [https://cr13.org/verlag/](https://cr13.org/verlag/) #### Underscores in URL path (prefer hyphens) - Rule: `url.underscores` · Category: URL · Occurrences: 11 - [https://cr13.org/produkt/buch_0/](https://cr13.org/produkt/buch_0/) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig-e1606410437526.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig-e1606410437526.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig10-e1606410355545.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig10-e1606410355545.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig2-e1606410429684.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig2-e1606410429684.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig3-e1606410422961.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig3-e1606410422961.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig4-e1606410415289.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig4-e1606410415289.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig5-e1606410407516.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig5-e1606410407516.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig6-e1606410399922.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig6-e1606410399922.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig7-e1606410391388.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig7-e1606410391388.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig8-e1606410383166.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig8-e1606410383166.jpg) - [https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig9-e1606410368570.jpg](https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig9-e1606410368570.jpg) ## Checks & coverage Crawlinx ran **157 technical-SEO checks** across 27 categories. Categories marked ✓ are fully clean. - ✗ Agent Readiness — 12 warning(s), 16 notice(s) - ✓ AI Content — clean - ✓ Amp — clean - ✗ Budget — 1 warning(s) - ✗ Cache — 11 notice(s) - ✗ Canonical — 2 warning(s) - ✗ Content — 8 warning(s), 8 notice(s) - ✗ Crawlability — 1 notice(s) - ✗ Duplicate — 2 warning(s) - ✓ Geo — clean - ✗ Headings — 5 warning(s), 2 notice(s) - ✓ Hreflang — clean - ✗ Images — 3 warning(s), 2 notice(s) - ✗ Indexability — 2 warning(s) - ✗ Links — 2 warning(s), 12 notice(s) - ✗ Meta Description — 10 warning(s) - ✓ Mobile — clean - ✗ Performance — 12 warning(s), 39 notice(s) - ✓ Rendering — clean - ✗ Robots — 1 warning(s) - ✗ Security — 12 notice(s) - ✗ Sitemap — 2 warning(s) - ✗ Social — 20 notice(s) - ✗ Structured Data — 1 warning(s), 7 notice(s) - ✓ Titles — clean - ✗ URL — 11 notice(s) - ✓ Video — clean --- *Generated by [Crawlinx](https://crawlinx.com) · free technical-SEO audits · https://crawlinx.com/audit/cr13.org* ## 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