AI discoverability, in depth.

The complete guide to llms.txt

What llms.txt is, why it exists, how to write one, and whether AI engines actually use it.

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GEO: Generative Engine Optimization

What GEO is, how it differs from SEO, and the practical playbook for ranking in ChatGPT, Perplexity, and Claude.

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GPTBot: how to allow OpenAI to crawl your site

What GPTBot is, what it's used for, and the exact robots.txt to allow or block it.

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ClaudeBot: how to allow Anthropic to crawl your site

What ClaudeBot is, the difference between ClaudeBot, anthropic-ai, and Claude-Web, and the exact robots.txt to allow or block each.

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The complete list of AI crawlers in 2026

Every AI crawler operating against the public web as of May 2026 — user-agent, operator, what it fetches, whether it honors robots.txt, and the recommended policy.

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Schema markup for AI search: a 2026 reference

Which schema types matter for ChatGPT, Perplexity, Claude, and Gemini — and which Google-era schemas are now noise.

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AI citation readiness: write pages AI engines cite

The structural and editorial signals that determine whether AI engines cite your page in their answers.

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Perplexity SEO: how to be cited by Perplexity

Perplexity is the most citation-friendly AI engine in 2026. Here's how its index works and what to optimize.

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