The Citation Index · Research
Research & Analysis
Data-driven reports on generative engine optimization and the tools that measure whether ChatGPT, Perplexity, Gemini and Google AI Overviews see (and cite) your brand.
18 piecesEvery figure sourced from the quality-gated indexBuilt to be cited
Latest reportBuyer's guide
Leading AI Visibility and GEO Software: Which Do Both
Of the 76 AI-visibility tools CitedIndex indexes, 44 also do generative engine optimization, and 15 of those track all six major engines. Re-derived 18 August 2026.
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Statistics
Subscription or Nothing: How 72 AI-Visibility Tools Bill
AI-visibility cost scales with usage. Billing doesn't: of the 69 tools where we could determine the model, 59 sell a subscription and one bills per unit consumed.
Statistics
Who Publishes a Price? 68 AI-Visibility Tools vs 11 Managed Services
Four of the 68 AI-visibility software tools in our index sell only on a custom quote. Among managed GEO services, 6 of 11 do: the clearest split in the category.
Statistics
Which AI-Visibility Tools Show Their Work? A Methodology Census
We checked 74 AI-visibility tools for a public methodology behind their accuracy claims. 36 claim precision with zero evidence. Only 6 show their work.
Data report
What 'Free' Actually Means Across 74 AI-Visibility Tools
17 tools have a real ongoing free tier, 31 offer only a time-limited trial, 18 offer nothing free. What each 'free' claim actually caps, from our own gated data.
Buyer's guide
Prompt Volume, Seats or Credits: How AI-Visibility Tools Price
Two tools quoting $99/month can mean 15 prompts or 100. We mapped six different pricing units across our index so a quote is comparable, not just a number.
Buyer's guide
How to Choose an AI Visibility Tool: 7 Things to Check
36 of our 71 indexed software tools advertise a free trial; 17 offer nothing free at all. A checklist for choosing an AI-visibility tool, from our own gated data.
Statistics
Which AI Engines Do AI-Visibility Tools Track? The 2026 Census
Of the 75 AI-visibility tools where we could determine engine coverage, 74 track ChatGPT and just 31 track Microsoft Copilot — the engine most tools still skip.
Buyer's guide
SSO and SOC 2 in AI-Visibility Tools: Included or Gated?
We checked 89 AI-visibility listings for SSO, SOC 2 and trust controls. Twenty-seven name one, and only Nightwatch puts SSO on a published price.
Statistics
Which AI-Visibility Tools Can Your Own AI Agent Actually Query?
We checked all 89 listings in our index for MCP server support. 24 ship one — but only 10 don't gate it behind a paid tier, a subscription, or a sales call.
Comparison
First Page Sage vs iPullRank vs Omniscient Digital
Three GEO agencies, three theories of earning AI citations — reputation, technical fetchability, or pipeline-tied content. A side-by-side matrix and how to choose.
Comparison
GEO Agency or Software? How to Choose in 2026
14 GEO agencies charge $1,597 to $24,000+ a month; software runs $29 to $399. A decision framework for which approach fits your team and budget.
Statistics
AI Search Statistics 2026: The Data Behind the Shift
Zero-click search hit 68% and AI Overviews cut organic clicks up to 60% — the sourced 2026 data on traffic, marketer budgets, and our own GEO tool index.
Market analysis
Who's Backing Your GEO Stack? The 2025-2026 Money Wave
Three acquisitions — including Adobe's $1.9B Semrush deal — and $200M+ in funding hit seven tools in our index within 15 months. What each means for buyers.
Methodology
10 AI-Visibility Vendor Facts That Changed Since We Last Checked
Re-verifying listings before publishing caught 10 real pricing and feature drifts this month — what changed, why, and how to check a vendor's claims yourself.
Comparison
Peec vs Profound vs Scrunch vs Otterly: How to Choose
Four AI-visibility platforms span $29/month self-serve to custom enterprise. A side-by-side comparison and a decision framework for which one fits your team.
Report
How AI answer engines cite sources (and why it moves)
Three large studies of AI citations show ChatGPT, Perplexity and Google AI Overviews cite different sources — and that the mix keeps shifting. Here is the data.
Market analysis
The State of GEO & AI-Visibility Tools 2026 — A Landscape Report
An analysis of the 74 most-researched AI-visibility and GEO tools: pricing, engine coverage, API availability and market segments, from verified, sourced listings.
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02 Companion guides
Evergreen playbooks for earning citations across the AI answer engines.