A plain guide
What is an AI visibility checker?
An AI visibility checker tells you how your website looks to AI tools like ChatGPT, Claude, Perplexity, Gemini and Copilot. People ask these tools questions, and the tools answer by reading web pages. If they cannot reach or read your page, they cannot use it in an answer.
The name covers two different kinds of AI visibility tool. Some, often called AI visibility trackers or LLM visibility trackers, send many questions to AI tools and count how often your brand comes up. Others check your website itself: whether AI bots are allowed in, whether they can read your text, and what to fix. This free AI visibility checker is the second kind. It looks at the part you control, and that part has to be right before anything else can work.
Why AI search visibility starts with access
Every AI search tool relies on bots: small programs that visit web pages and fetch the text. Your robots.txt file, a short text file at the root of your site, tells each bot whether it may come in. A site can block AI bots without meaning to, for example with an old rule copied from another site.
The AI companies are clear about what happens next. OpenAI says sites that block its search bot, OAI-SearchBot, "will not be shown in ChatGPT search answers". Perplexity recommends allowing its search bot in robots.txt "to ensure your site appears in search results", and Anthropic says its bots follow robots.txt. So a blocked search bot means that tool cannot read your page, however good the page is.
Being allowed in is only half of it. Vercel and MERJ reported in December 2024 that none of the major AI crawlers they studied ran JavaScript, with Google's Gemini as the exception. If your words only appear after JavaScript runs, many AI bots may see an empty page.
Why we only score what the evidence supports
Many AI SEO checkers give points for things no AI company has said it uses. We take a stricter line. A check earns points only if an AI company's own documentation says it matters, or a large study shows a clear pattern. Every check on your report links to its source, and How it works lists all seven checks with their points.
Two examples. In Kevin Indig's study of 18,012 ChatGPT citations, 44% came from the first 30% of a page, which is why a short answer near the top earns points. In SE Ranking's study of 216,524 pages, pages updated in the last three months averaged 6.0 ChatGPT citations against 3.6 for older pages. These studies show patterns, not proof that one change causes another, and we say so in the report.
The same rule works the other way. Ahrefs found that 97% of the llms.txt files in its study got no visits at all in May 2026, and SE Ranking found no link between llms.txt and AI citations. So llms.txt earns 0 points here, even though many other tools score it.
How to use the free AI visibility checker
- Type a page address in the box at the top and press Check my site. Start with your homepage or your most important page.
- Read your score and the list of checks. Each one says what we found and whether it passed.
- Open the fix guide for anything that failed. Each guide gives the exact steps, then shows how to check the fix worked.
It is a free AI visibility tool, with no sign-up and no email. You can run 10 checks an hour. Check each important page on its own, since one page can pass while another fails.
What a good score means, and what it does not
A high score means AI tools can reach your page and read what is on it. That is the base everything else needs. It does not promise that ChatGPT or any other tool will mention you, rank you or link to you. That depends on many things no outside tool can see, such as what people ask and which other pages answer it.
So treat the score as a checklist, not a forecast. Fix whatever blocks AI bots first, since that has the clearest evidence, then work on how the page is written. If you want to see how often AI tools mention your brand over time, that needs a tracking tool, which is a different job from this AI search visibility checker.