duolingo.com
Fetched 2026-10-23. Graded D, 58 of 100, 7 findings.
llms.txtagents.mdMedia kitEntity graphAI access policyAgent-callable
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Get these 7 findings fixed
Every defect this row counts, corrected on the site itself and then re-measured from the outside — done is measured, not asserted. One-time, $500 for one local-business site, thirty days of monitoring included.
Get this fixed — $500Claiming is free and changes nothing but the owner mark. What a licence adds is the record behind this entry: re-measured twice a day, finding age on every defect, change receipts between any two dates. Keep it on the daily record.
What the fetch found
| Finding | Severity |
|---|---|
| robots.txt rules do not apply to named agents | 3 of 5 |
| The page’s content only exists after JavaScript runs | 3 of 5 |
| An answer engine's crawler was refused while a browser was served (seen once, not yet reproduced) | 2 of 5 |
| The sitemap does not say when anything changed | 2 of 5 |
| The homepage is reached through a chain of redirects | 1 of 5 |
| No llms.txt | 1 of 5 |
| HTTPS is served without a Strict-Transport-Security header | 1 of 5 |
Section scores on this fetch
Weakest first. 5 of 18 scored sections at 90 or above.
| Section | Score |
|---|---|
| Authorship and trust signals (E-E-A-T proxies) | 0 |
| Naming and case consistency | 25 |
| Speed a crawler sees, and field data where it exists | 33 |
| Schema and entity graph | 43 |
| What each agent receives | 50 |
| Mobile surface | 50 |
| Server and hosting | 60 |
| Payload and render path | 60 |
| Accessibility structure (from the delivered HTML) | 73 |
| Error pages | 75 |
| Internal linking | 75 |
| Machine layer | 80 |
| Sitemap coverage | 83 |
| Crawl waste | 100 |
| AI and search agents | 100 |
| Machine-file trust chain | 100 |
| Agent instruction surface | 100 |
| Exposed files and secrets | 100 |
Shelves
| Shelf | State | Definition |
|---|---|---|
| llms.txt | not found | What counts, and who has it |
| agents.md | not found | What counts, and who has it |
| Media kit | not found | What counts, and who has it |
| Entity graph | not found | What counts, and who has it |
| AI access policy | on the shelf | What counts, and who has it |
| Agent-callable | not found | What counts, and who has it |
The full report for this fetch
Machine-readable: /api/registry?host=duolingo.com. This row states what was served to CrawlCheck at that time. It is not an endorsement, and it says nothing this scan did not measure.