Is your site blocking AI crawlers?
One line in a robots.txt can keep ChatGPT, Claude or Perplexity from ever reading your site. It is usually there by accident, copied from a template or added by a plugin. This reads your file and tells you which of 16 AI crawlers are allowed in.
Reads your public robots.txt only. Nothing is stored, no sign-up, and the check costs nothing to run.
The finding most tools get wrong
A scanner that sees Google-Extended: Disallow and reports "you are invisible to Google's AI" is wrong, and acting on it can do real damage.
Google-Extended controls whether your content can be used for Gemini app grounding and Vertex AI training. AI Overviews in Google Search are built from the Search index, which follows Googlebot. So you can block Google-Extended and still show up in AI Overviews. If someone unblocks the wrong bot chasing that finding, or touches Googlebot to fix it, they can drop the site out of Google Search altogether.
The table above keeps those two rows separate and says which is which.
What this tool does not tell you
Whether an assistant can reach your pages, and whether it names you when a buyer asks, are different questions. Crawlability is necessary and nowhere near sufficient. Plenty of sites are perfectly crawlable and still never cited, because citation also turns on how clearly you are described, how current the page is, and who else on the web corroborates you.
There is no way to infer that from a robots.txt. You have to ask the assistants the questions your buyers ask, and read what comes back. That is the part the product does.