# Free AI crawler tools

> Four free checks that need no account: what GPTBot sees, a per-crawler robots.txt tester, an llms.txt checker, and the AI crawler reference.

- Canonical page: https://lantad.co/tools
- This file: https://lantad.co/tools.md

## Key facts

- **Cost:** Free, no signup.
- **Result retention:** Tool results are kept for 18 months at an unguessable, noindex address, then deleted.

## Related

- https://lantad.co/tools/what-gptbot-sees (markdown: https://lantad.co/tools/what-gptbot-sees.md)
- https://lantad.co/tools/robots-txt-tester (markdown: https://lantad.co/tools/robots-txt-tester.md)
- https://lantad.co/tools/llms-txt (markdown: https://lantad.co/tools/llms-txt.md)
- https://lantad.co/tools/ai-crawlers (markdown: https://lantad.co/tools/ai-crawlers.md)

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Lantad measures whether AI crawlers can actually read a page: it fetches as a non-rendering
crawler, renders as a browser, and reports the gap. Free scan, one URL, no signup.

Method and weights: https://lantad.co/methodology | All pages as markdown: https://lantad.co/md | Crawler policy: https://lantad.co/bot