The Signalor LLM Checker is a free tool that diagnoses whether AI search engines can discover, access, and cite your website. It validates the presence and structure of your llms.txt manifest, the file that guides language models to your most important content. The checker parses robots.txt for AI bot directives covering GPTBot (ChatGPT / OpenAI), ClaudeBot (Anthropic Claude), PerplexityBot (Perplexity AI), Google-Extended (Gemini / AI Overviews), and OAI-SearchBot. It also verifies sitemap reachability and scans on-page signals including Organization schema, Article JSON-LD, canonical tags, and Open Graph metadata. Missing or blocking configurations silently prevent AI citations even when content quality is high. Results are instant with no account required. The full Signalor GEO audit adds live probes that show exactly how each AI engine describes and cites your brand.
[ free tool · llm checker ]
See if AI can find and cite your site
Enter a domain and we'll check llms.txt, robots.txt AI-bot rules, sitemap, and on-page schema, an honest LLM-readiness score, free.
The checker verifies your llms.txt manifest, parses robots.txt for GPTBot, ClaudeBot, PerplexityBot, and Google-Extended directives, confirms sitemap reachability, and scans on-page signals like Organization schema, canonical tags, and Open Graph metadata. Results are instant with no sign-up required.
llms.txt check
Verifies whether you publish a llms.txt manifest and how many sections it exposes.
AI crawler rules
Parses robots.txt for GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and more.
On-page signals
Title, description, Open Graph, canonical, Organization schema, sitemap reachability.
Free forever
Run unlimited checks without an account.
[ what's inside the full report ]
Go beyond readiness , real AI probes
The free tool shows crawlability and schema signals. Sign up or upgrade to run live probes across ChatGPT, Claude, Gemini, and Perplexity.
Live AI probes · 4 engines
See how ChatGPT, Claude, Gemini, and Perplexity actually describe your brand, with paraphrase & citation tagging per line.
Sentiment + prompt trend
Week-over-week sentiment delta and the prompts that drove the biggest shifts.
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