llmstxt-check

About llmstxt-check

llmstxt-check is a free validator for the llms.txt file, the plain-text guide that tells AI agents what a website is about and which pages matter most. It is aimed at site owners who want to confirm their /llms.txt file actually follows the format published at llmstxt.org.

You enter a domain and the tool checks whether its llms.txt follows the spec. There is no signup required for the check itself. A paid option at 0.03 USDC on Base drafts a starter llms.txt from a site's homepage, giving owners a starting point to edit.

The product is built by Doormat Capital and stays deliberately narrow: it does one job, checking llms.txt files against the spec, rather than trying to be a general SEO or AI visibility suite.