The SignalorAI 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 SignalorAI GEO audit adds live probes that show exactly how each AI engine describes and cites your brand.
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.
Features
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.
llms.txt is a plain-text manifest that tells AI models which pages contain your most important content, similar to how robots.txt guides search crawlers. Publishing a well-structured llms.txt helps ChatGPT, Claude, and other language models locate your best content faster and increases the chance of accurate citations.
The checker parses robots.txt for GPTBot (ChatGPT), ClaudeBot (Claude / Anthropic), PerplexityBot (Perplexity), Google-Extended (Google AI Overviews / Gemini), OAI-SearchBot, and other known LLM user-agent strings. Blocked crawlers can silently prevent AI citations even when your content is excellent.
The checker scans for Organization schema, Article schema, canonical tags, Open Graph metadata, title and meta description presence, sitemap reachability, and HTTPS enforcement, the signals AI systems rely on to establish trust before citing a page.
It removes the technical blockers that silently prevent AI engines from reading and citing your content. Earning citations also requires strong content quality, topical authority, and clear entity definitions, all areas SignalorAI's full GEO audit covers.
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Turn AI search into your highest-intent pipeline
Run a free GEO audit, track citations across models, and ship fixes that change how ChatGPT, Perplexity, and Gemini talk about you.
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