Four free browser tools for AI search visibility. The citability grader scores a page 0 to 100 across 12 checks for how easy it is for ChatGPT, Gemini, Claude and Perplexity to quote, with a fix for each failed check. The robots.txt checker shows which of 21 AI crawlers can reach your pages. The llms.txt generator builds a spec-valid file and the schema generator writes validated JSON-LD. No sign-up, and nothing you paste leaves your browser.