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CitedIndex is a researched, quality-gated directory of the tools that measure and improve how AI engines — ChatGPT, Perplexity, Gemini and Google AI Overviews — see and cite your brand. Every listing is a verified, structured record with sourced facts and a last-verified date; thin auto-generated pages are structurally impossible. Browse by category, compare features, pricing and API access, and find the right GEO / AI-visibility tool for your stack. Machine-readable too: llms.txt, per-listing markdown, JSON and an MCP endpoint.