AI Visibility Checker is a tool that evaluates if AI crawlers can access, read, and cite website content. It examines three key factors: robots.txt configurations to ensure access for crawlers like OpenAI's OAI-SearchBot and PerplexityBot, readable text delivery instead of JavaScript-rendered content, and the presence of an optional llms.txt file to guide AI tools. The platform offers an llms.txt generator, validator, and an AI crawler census with JSON data on sites blocking specific bots. Guides cover appearing in ChatGPT search results, verifying AI accessibility, and generative engine optimization. It distinguishes between GPTBot, which collects training data, and OAI-SearchBot, which enables citations, noting that blocking one doesn’t affect the other. The tool analyzes public files like robots.txt and sitemaps without requiring accounts or storing user data.