The Citation Index · Research
Market and data
Understand the AI-visibility market with original research, product statistics and source-linked analysis.
Our researchStatistics
AI search statistics 2026: the data behind the shift
Dated AI-search studies and enterprise survey findings, with corrected source attribution, study windows, denominators and limits on causal claims.
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Try a tool's name, an engine such as ChatGPT, or a topic like pricing.
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Buyer's guide
Your AI Visibility Score Is a Probability
Two studies show AI answers rarely repeat the same brands or sources, and what that means for reading AI visibility reports and choosing a tool.
Buyer's guide
Prompt volume, seats or credits: how AI-visibility tools price
Compare configured prompts, answer runs, bundled limits, credits and self-hosting costs using dated vendor examples, not monthly sticker prices alone.
Market analysis
Who's backing your GEO stack? The 2025-2026 money wave
Ten dated GEO financing and acquisition events through July 2026, separating disclosed terms and company plans from unsupported pricing and survival predictions.
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