# Three Impact

> Measured data on how AI crawlers and assistants treat real small-business websites, plus a free AI access checker, a crawler registry and evidence-based guides.

Ownership: Three Impact is published by the team behind cite-met and Space & Story. cite-met appears in our comparisons; we say so wherever it does.

## About

- [About Three Impact: who runs it, how we measure, how we make money](https://threeimpact.com/about): Three Impact is published by the team behind cite-met and Space & Story. Who we are, where the Observatory data comes from, how we protect it, and how we're funded.

## Tools

- [AI access checker: can ChatGPT, Claude and Perplexity read your site?](https://threeimpact.com/ai-access-checker): Free check of your robots.txt against 21 AI crawlers and tokens, plus noindex, nosnippet, text-without-JavaScript, schema and llms.txt, with a fix for each.

## Reference

- [AI crawler registry: every AI bot, its user agent and what blocking it costs](https://threeimpact.com/ai-crawler-registry): GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended and 21 more: user agents, robots.txt tokens, verification links and observed share.

## Observatory · Q4 2026 edition

- [The AI Search Observatory: what AI crawlers did on 12 small-business sites](https://threeimpact.com/ai-search-observatory): Measured, not modelled: AI crawlers fetched small-business sites 4.4x as often as Googlebot, yet sent 1 visit per 120 fetches. Q4 2026 data and method.

## Compare

- [AI visibility (AEO) tracking tools compared: prices, what they measure, who they're for](https://threeimpact.com/ai-visibility-tracking-tools): Profound, Peec AI, Otterly.AI, Semrush AI Visibility Toolkit, Ahrefs Brand Radar, Scrunch and cite-met: sourced prices (Oct 2026), what each measures, who it fits.
- [Website platforms ranked by AI-readiness: Wix, Squarespace, Webflow, Framer, WordPress, Shopify and more](https://threeimpact.com/website-platforms-ai-readiness): Which website platforms serve real HTML to AI crawlers and let you control robots.txt, llms.txt and schema. Wix, Squarespace, Webflow, Framer, WordPress, Shopify, SPAs.

## Guides

- [Does llms.txt matter? What the evidence says in 2026](https://threeimpact.com/does-llms-txt-matter): Google says it doesn't use llms.txt and no major assistant documents reading it. Who supports it, who reads it, and whether a small business should bother.
- [How AI assistants pick which businesses to recommend](https://threeimpact.com/how-ai-assistants-recommend-businesses): What the evidence says about how ChatGPT, Google AI Overviews, Copilot and Perplexity choose businesses: Ahrefs' studies, Google's guidance, BrightLocal and our data.
- [robots.txt for AI crawlers: what blocking each one costs you](https://threeimpact.com/robots-txt-ai-crawlers): Which AI bots to block and which to keep: the cost of blocking training, search and live-fetch crawlers, with copy-paste robots.txt recipes for small business.