# Envoyix > Envoyix audits any public URL for Generative Engine Optimization: whether ChatGPT, Perplexity, Claude, Gemini and Google AI Overviews can crawl it, understand it, and cite it as a source. Envoyix is a free, no-signup web tool. Paste a URL and it fetches the page along with its robots.txt, llms.txt and sitemap, then scores it across 22 checks in four categories — crawlability, structure, authority and content — and returns an ordered list of fixes. Every audit is a live fetch; reports are held in memory for 60 seconds and never written to disk. The full Markdown text of every guide on this site is available at /llms-full.txt. ## Guides - [What is GEO (Generative Engine Optimization)?](https://envoyix.vercel.app/learn/what-is-geo): Generative Engine Optimization is the practice of structuring web content so that AI answer engines can crawl it, understand it, and cite it as a source. - [GEO vs SEO: what carries over and what does not](https://envoyix.vercel.app/learn/geo-vs-seo): GEO and SEO share crawlability and structure as a foundation, but SEO optimises for a position in a ranked list while GEO optimises to be the passage quoted inside a generated answer. - [How to structure content for AI citations](https://envoyix.vercel.app/learn/structure-content-for-ai-citations): Structure each page so that any passage lifted out of it still makes sense on its own — lead with the answer, phrase headings as questions, and name subjects instead of using pronouns. ## Tool - [Run an audit](https://envoyix.vercel.app/analyze): Submit a public URL and get a weighted GEO score with per-check findings and fixes. - [Frequently asked questions](https://envoyix.vercel.app/faq): How the score is calculated, why checks are weighted differently, whether to block AI crawlers, and what llms.txt is for. - [About Envoyix](https://envoyix.vercel.app/about): How the analyzer works, which crawlers it checks, how it identifies itself, and what its limits are. ## Optional - [llms-full.txt](https://envoyix.vercel.app/llms-full.txt): The complete Markdown source of every guide, in one file.