Free tools to check your site for AI search
Nine free tools for AI search. The site checkers run GEOFast's X-ray and open the report at the part you asked about: AI crawler access, robots.txt rules, JavaScript rendering, what the AIs say about you, or the full GEO audit. The query fan-out tool shows the searches ChatGPT ran for a question. The robots.txt and llms.txt generators and the AI visibility change checker run in your browser.
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Pick the question you have.
AI visibility checker
AI visibility is two things: whether AI crawlers can read your site, and whether the assistants name you when buyers ask. GEOFast checks the first in about a minute with no account, then puts three of your buyers' questions to ChatGPT, Perplexity and Gemini and shows who they named.
AI crawler checker
See which AI crawlers your site lets in. GEOFast checks 13 of them against your robots.txt and fetches your homepage as the 4 that answer questions for ChatGPT, Claude and Perplexity.
robots.txt checker for AI crawlers
Find out what your robots.txt tells 13 AI crawlers, from the rules written for each one to the wildcard rules they fall back on, and which of your important pages each may read.
robots.txt generator for AI crawlers
Choose which AI crawlers may read your site and copy the robots.txt lines that say so. The generator covers the 13 crawlers GEOFast's X-ray tests, in three groups, and runs in your browser: nothing you choose is sent or stored.
JavaScript rendering checker
Vercel's 2024 study of AI crawler traffic found GPTBot, ClaudeBot and PerplexityBot don't run JavaScript. GEOFast renders your homepage and up to 3 key pages in a browser and shows how much of their text only appears after scripts run.
llms.txt generator
Build an llms.txt file in the llmstxt.org format, or paste one to check it against that format. Both run in your browser. No study has shown llms.txt changing AI answers. Publish one because it costs little.
Query fan-out tool for ChatGPT and Claude
See the web searches ChatGPT and Claude run to answer a question. Instead of asking a language model to guess them, GEOFast puts your question to ChatGPT's app, as a signed-out visitor in the US, and to Claude with web search, and reads the searches each actually ran and the pages each cited.
AI visibility change checker
Say AI answers named you in 15% of answers last month and 25% this month. Is that a real change, or the usual swing between runs? Enter both counts and the checker gives each rate a 90% range and a verdict, by the rule GEOFast's dashboard uses: a change is real only when the two ranges don't overlap.
GEO audit
A GEO audit shows what stands between your site and AI answers. GEOFast reads up to 300 pages the way AI crawlers do, runs 21 checks and ranks the fixes, with the code for each.
Keep reading
- GuidesThe questions site owners ask about AI answers and the crawlers behind them, answered from the vendors' own pages.
- AI crawlers listThe 13 crawlers the X-ray reads for, by the company that runs them: user agents, robots.txt names and what blocking each does.
- Free AI visibility tools, comparedWhat each tool gives away without a trial.
Find out what AI says about your site.
Paste your URL and leave with a ranked list of what to fix, with steps and code.
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- No account