AI Crawler Checker: See what your robots.txt says to 15 AI crawlers

Hi everyone, I'm max hwang, a full-stack developer in Korea. I kept opening robots.txt files by hand to see whether a site had said anything to GPTBot or ClaudeBot, so I wrote a checker. You type a domain, it fetches robots.txt and shows one verdict per AI crawler for the 15 user agents it tracks. The matching is RFC 9309: longest pattern wins, allow wins on a tie, an empty Disallow is not a rule. It also writes a snippet that blocks whatever is still open. A second page checks and generates llms.txt against the llmstxt.org proposal. Only a missing H1 is an error; the rest are warnings. Everything is rule based, so there is no LLM cost and no signup. The API returns JSON if you want to script it. I would like to hear which crawlers you think are missing from the list.