# Answerworthy > Answerworthy is an Answer Engine Optimization (AEO) platform: it measures how AI engines > (ChatGPT, Perplexity, Gemini, Claude) talk about a brand, scores whether AI crawlers can reach > and read the brand's site across a 91-check catalog, and turns both into a ranked fix list. Every page on this site is also available as Markdown: append `.md` to any path (the homepage is `/index.md`), or send `Accept: text/markdown`. ## Product - [How Answerworthy works](https://answerworthy.ai/product.md): the four measurement layers, and why the measurement is trustworthy. - [Run a free scan](https://app.aeo-test.ai): the readiness scan reads a site the way AI crawlers do and returns a scored, check-by-check report. ## Guides - [What is AEO? Answer Engine Optimization, explained](https://answerworthy.ai/guides/what-is-aeo.md): Answer Engine Optimization (AEO) is how brands earn citations in AI answers. What it is, how it differs from SEO, and how to measure and improve it. ## Company - [Homepage](https://answerworthy.ai/index.md): what Answerworthy does, the evidence for AEO, and frequently asked questions. ## Optional - [Sitemap](https://answerworthy.ai/sitemap-index.xml): full URL inventory. - [robots.txt](https://answerworthy.ai/robots.txt): crawler policy: all AI crawler classes are welcome, declared via Content-Signal. Last reviewed: 2026-08-03. This file is generated from the site's own content registry and is curated: it lists every live page with a one-line description, and grows as the library expands.