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.
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52 pieces in the library below
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Latest reportBuyer's guide
Which AI Visibility Tools Generate Content?
Learn which AI visibility tools draft articles or other materials, which offer only limited generation, and what that distinction means for buyers.
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Buyer's guide
AI Visibility Tools for Agencies: What to Check
Compare AI visibility tools for agencies by engine coverage, client limits, reporting, optimization features, pricing, and trial terms.
Buyer's guide
What This Week’s AI Visibility Tools Do
A comparison of what each tool measures, how it turns findings into work, who it suits and what its published pricing says.
Data report
Self-serve signup: a census of 122 listings
82 of 122 listings answer yes for “Self-serve signup”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
ChatGPT: a census of 122 listings
116 of 122 listings answer yes for “ChatGPT”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Competitor tracking: a census of 122 listings
108 of 122 listings answer yes for “Competitor tracking”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Card required to start: a census of 121 listings
9 of 121 listings answer yes for “Card required to start”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Prompts tracked: a census of 122 listings
91 of 122 listings answer yes for “Prompts tracked”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
How often it checks: a census of 121 listings
94 of 121 listings answer yes for “How often it checks”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Countries and languages: a census of 121 listings
57 of 121 listings answer yes for “Countries and languages”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Publishes to your site: a census of 122 listings
24 of 122 listings answer yes for “Publishes to your site”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Sources it names: a census of 122 listings
102 of 122 listings answer yes for “Sources it names”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Tells you what to change: a census of 122 listings
101 of 122 listings answer yes for “Tells you what to change”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Perplexity: a census of 122 listings
93 of 122 listings answer yes for “Perplexity”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Meta AI: a census of 122 listings
8 of 122 listings answer yes for “Meta AI”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Engines tracked: a census of 122 listings
84 of 122 listings answer yes for “Engines tracked”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Gemini: a census of 122 listings
88 of 122 listings answer yes for “Gemini”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Optimises existing content: a census of 122 listings
90 of 122 listings answer yes for “Optimises existing content”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
BI export: a census of 122 listings
11 of 122 listings answer yes for “BI export”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Google AI Overviews: a census of 122 listings
80 of 122 listings answer yes for “Google AI Overviews”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
How AI describes you: a census of 122 listings
66 of 122 listings answer yes for “How AI describes you”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
DeepSeek: a census of 122 listings
14 of 122 listings answer yes for “DeepSeek”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
API access: a census of 122 listings
27 of 122 listings answer yes for “API access”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Projects or brands: a census of 122 listings
55 of 122 listings answer yes for “Projects or brands”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Technical AEO fixes: a census of 122 listings
67 of 122 listings answer yes for “Technical AEO fixes”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Grok: a census of 122 listings
27 of 122 listings answer yes for “Grok”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Generates content: a census of 122 listings
63 of 122 listings answer yes for “Generates content”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
MCP server: a census of 122 listings
43 of 122 listings answer yes for “MCP server”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Claude models: a census of 122 listings
56 of 122 listings answer yes for “Claude models”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Google AI Mode: a census of 122 listings
49 of 122 listings answer yes for “Google AI Mode”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
AI crawler analytics: a census of 122 listings
22 of 122 listings answer yes for “AI crawler analytics”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Done-for-you service: a census of 122 listings
40 of 122 listings answer yes for “Done-for-you service”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Microsoft Copilot: a census of 122 listings
35 of 122 listings answer yes for “Microsoft Copilot”. Counted from our own datasheet, with the query that reproduces every figure.
Data report
Accuracy disclosure: a census of 122 listings
23 of 122 listings answer yes for “Accuracy disclosure”. Counted from our own datasheet, with the query that reproduces every figure.
Statistics
Which AI-Visibility Tools Have an API, and What Plan Carries It?
API access versus plan entitlement: a corrected August 2026 report, with unreproduced totals withdrawn and sourced REST, MCP and self-hosting distinctions.
Buyer's guide
AI Visibility and GEO: The 22 August 2026 Six-Engine Shortlist
The dated 79-tool edition recorded 15 in both categories with six engine tags. Historical taxonomy recovered; trials and prices are not current offers.
Statistics
AI-Visibility Billing Census: Corrected Historical Findings
Corrections to the August 2026 billing census: signup credits do not establish ongoing free access. Historical totals withdrawn, not remeasured.
Statistics
Who Published a Price? The 13 August 2026 CitedIndex Study
Historical pricing records: 59 of 68 readable software records include a currency price; 6 of 11 readable service records use quote pricing. Dated 13 August 2026.
Statistics
Which AI-Visibility Tools Show Their Work? A Methodology Census
A dated 74-tool transparency review: six had inspectable supporting material, not independently validated accuracy. Corrected evidence scope and sampling units.
Data report
Free-Access Census: Corrections to the August 2026 Findings
The August 2026 free-access census is corrected, not remeasured: recurring allowances, signup grants and plan-specific trials must be distinguished.
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.
Buyer's guide
How to Choose an AI Visibility Tool: 7 Things to Check
Seven checks for choosing an AI-visibility tool, with explicitly dated August 2026 census findings and practical questions about engines, evidence, access and cost.
Statistics
Which AI Engines Do AI-Visibility Tools Track? The 2026 Census
Recovered August 2026 engine-tag counts across 85 directory listings, with explicit limits on what tags establish about live monitoring and plan access.
Buyer's guide
SOC 2 Type II and SSO in AI-Visibility Tools: Included or Gated?
Corrections to the archived security census: SOC 2 report scope, plan-specific SSO and account support are different findings; unsupported totals are withdrawn.
Statistics
Which AI-Visibility Tools Can Your Own AI Agent Actually Query?
A corrected MCP access report: historical totals withdrawn, vendor research preserved, and API, server, tier and read-only distinctions explained.
Comparison
First Page Sage vs iPullRank vs Omniscient Digital
First Page Sage, iPullRank and Omniscient Digital compared by published scope, pricing evidence and questions to ask before hiring a GEO agency.
Comparison
GEO Agency or Software? How to Choose in 2026
Choose monitoring software, software-assisted execution or a GEO agency by ownership, deliverables, total commitment and evidence, without assuming guaranteed results.
Statistics
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.
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.
Methodology
Vendor Record Discrepancies: What the July Archive Can Prove
A correction to our July record: ten reported price and feature discrepancies, the missing before-and-after evidence, and checks buyers can repeat.
Comparison
Peec vs Profound vs Scrunch vs Otterly: How to Choose
Peec, Profound, Scrunch and Otterly compared by engine coverage, prompt capacity, integrations and billing commitments, with dated public-source examples.
Report
How AI answer engines cite sources: what the studies show
What Profound, Otterly and Ahrefs citation studies actually measure, where their samples and denominators differ, and what they do not prove about AI source selection.
Market analysis
The 20 August 2026 GEO Tool Landscape: Historical Tags, Pricing and Limits
A preserved 79-tool directory edition with recovered historical engine tags, corrected trial range, and explicit pricing, API and evidence limits.
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02 Companion guides
Evergreen playbooks for earning citations across the AI answer engines.
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