# GEO Checker

> GEO Checker is a free tool for Generative Engine Optimization (GEO) and AI search visibility. Paste a URL to analyze how well a site can be understood and cited by AI assistants like ChatGPT, Perplexity, Gemini, and Google AI Overviews. No signup required.

GEO Checker also publishes free standalone tools (hreflang checker, sitemap inspector, llms.txt validator) and plain-language guides on GEO, how it differs from SEO, and how AI answer engines pick their sources.

## Tools

- [GEO Checker (home)](https://geochecker.net/): Analyze any website for AI search visibility, GEO content quality, and citation readiness.
- [Hreflang Checker](https://geochecker.net/hreflang-check): Validate rel=alternate hreflang tags, catch missing return links, and confirm every locale resolves.
- [Sitemap Inspector](https://geochecker.net/sitemap-check): Check that a sitemap exists, compare it to live pages, and spot missing or extra URLs.
- [llms.txt Validator](https://geochecker.net/llms-txt): Check whether a site has llms.txt, llms-full.txt, or llms-small.txt and preview its AI crawler guidance.

## Guides

- [What Is Generative Engine Optimization (GEO)?](https://geochecker.net/geo-introduction): A plain guide to what GEO is and how to make content AI-ready.
- [GEO Checklist](https://geochecker.net/geo-checklist): Technical, content, and authority checks to make a site easy for AI to cite.

## Blog

- [What is Generative Engine Optimization (GEO)?](https://geochecker.net/blog/what-is-generative-engine-optimization): How GEO differs from SEO and how AI answers pick sources.
- [GEO vs SEO: What's the Difference?](https://geochecker.net/blog/geo-vs-seo): How the two differ, where they overlap, and a simple rule to remember.
- [The GEO Paper: How to Boost Visibility in AI Search](https://geochecker.net/blog/generative-engine-optimization): A deep dive into the Princeton GEO research paper and the methods it tested.
- [What Is BrowseComp?](https://geochecker.net/blog/browsecomp-the-ultimate-challenge-for-ai-agents): OpenAI's benchmark for hard, multi-step web questions that stump most AI agents.
- [ChatGPT vs Google Search](https://geochecker.net/blog/chatgpt-vs-google-search-performance-and-user-experience): A study comparing speed, accuracy, and the trade-offs of each tool.
- [WebGPT: Fact-Grounded AI](https://geochecker.net/blog/webgpt-fact-grounded-ai): How letting a model search and cite the web in real time improves factual accuracy.
- [Strategic Text Sequences](https://geochecker.net/blog/strategic-text-sequence-visibility): Research on how text sequences can manipulate LLM product recommendations.
- [When Explanations Fail, Trusting AI Becomes Pragmatic](https://geochecker.net/blog/why-trust-in-ai-may-be-inevitable): A breakdown of a knowledge-network model for explanation and trust in AI.

## About

GEO Checker focuses on how AI models understand and cite content, not just on search engine rankings. The analysis looks at content structure, context, authority signals, structured data, and how citation-friendly a page is for AI answer engines.