Citerank
The AI Search Visibility Blog
Original, in-depth guides on Generative Engine Optimization (GEO), getting cited by ChatGPT, Perplexity & Google AI Overviews, and building agent-ready websites.
Measurement & Data Studies
AI Engines Don't Read llms.txt. Not Even Stripe's.
467 probes across ChatGPT, Perplexity, Claude, Gemini and Grok, on 59 domains including Stripe, Notion, Vercel and Zapier. In 179 normally-phrased questions, llms.txt content reached an answer zero times, while the engines cited those same sites 100 times. The file is read only when you hand over the URL.
AI Agent Protocol Adoption Study 2026: 287 Companies, 21 Protocols
A crawl-based census of 287 major companies across SaaS, retail, and the Fortune 100. We requested 21 agent protocol endpoints from each, then tested how every site responds to a real AI agent. Five expose a callable interface.
What Is an AI Visibility Score? How It's Calculated (and What Counts as Good)
An AI visibility score measures how likely AI engines are to find, trust, and cite your site. Here is the exact five-layer methodology, real grade bands, and why a single score is misleading without a volatility check.
We Scored 19 Top SaaS Brands for AI Search Readiness. None Passed.
We ran 19 well-known SaaS brands through our AI Visibility Score. The best was Zapier at 69. No site earned an A or a B. Here is the original data and what it means for you.
Getting Cited by AI Engines
Why Isn't My Website Cited by AI? 10 Real Reasons (With Fixes)
A root-cause breakdown of the 10 most common reasons AI engines skip a site in favor of a competitor, each one a real, testable technical or content signal, not a guess.
Measurement and Data Studies
Otterly vs Peec vs Profound vs Citerank: An Honest Comparison
Pricing, methodology, and what each tool actually measures, from someone who built one of them. Includes real cost-per-prompt math and the prompt design trap no other comparison mentions.
AI Search Strategy
ChatGPT vs. Perplexity: Why You Cannot Use One Citation Strategy for Both
A 100,000-prompt study found only 11% domain overlap between ChatGPT and Perplexity citations. Here is what that means, and how to build platform-specific playbooks for each.
Getting Cited by AI
How to Rank in Google AI Overviews (2026)
Google AI Overviews sit on top of search and quote a handful of sources. Here is how eligibility works, which signals get you pulled in, and a step-by-step plan. With original data.
How to Get Cited by ChatGPT, Perplexity, and Google AI Overviews
A practical, tested guide to becoming a source AI engines quote. How each engine picks citations, the passage formula that works, and the fixes that get you in the answer.
Agentic AI
Agent-Ready Websites: The Complete Guide to MCP, WebMCP, and Agentic AI
AI agents are starting to browse, decide, and buy on behalf of users. Here is what an agent-ready website is, the protocols that matter (MCP, WebMCP, A2A, x402), and how to prepare before your competitors do.
Generative Engine Optimization
Generative Engine Optimization (GEO): The Complete 2026 Guide
What GEO is, how AI engines decide who to cite, and a five-part framework to get your site quoted by ChatGPT, Perplexity, and Google AI Overviews. With original data.