CheckAEO makes free tools for Answer Engine Optimization (AEO): checking whether AI answer engines like ChatGPT, Perplexity, and Google AI Overviews can read, understand, and cite your website. Its core product is a free AEO checker that scores any URL from 0 to 100, tests the exact questions a customer would ask, and shows the one thing to fix first and what to skip, without the 40-factor dashboards other tools hand you. CheckAEO is operated independently by Gideon Caranzo and grounded in original research, including a study of AI comprehension across 554 sites. The approach is deliberately honest: measure what AI can actually read on the page, not vanity metrics.