a14y (Agent Readability)

a14y scores any web page — or an entire site — for how readable it is by AI agents. When ChatGPT, Claude, Copilot, or Cursor fetch the web on a user's behalf, most of what makes a page work for humans (layout chrome, interactive widgets, client-side routing) actively gets in the way. The a14y scorecard measures the signals that actually matter to an agent: whether your content is discoverable, parseable, and comprehensible. What it does Open the extension on any page and hit **Check this page** to run the scorecard against that single URL, or **Scan whole site** to crawl from the entry URL following same-origin links. In seconds you get a 0–100 score plus a per-check breakdown: which signals you're nailing, which ones agents can't find, and a link to the fix guidance for each failing check. Every audit runs entirely in your browser. No server, no account, no data collection — just the extension and the page you're auditing. What it measures - Discoverability — robots.txt, sitemap, llms.txt, canonical links, redirect chains, HTTP 200 hygiene. - Parsing — content-type headers, HTML lang attribute, meta description, OG tags, JSON-LD, Markdown alternate links, text ratio. - Comprehension — headings, code-language tags, semantic structure, and a growing set of content-shape checks. Each check is versioned in an open scorecard at a14y.dev — a pinned v0.2.0 today — so scores from different runs stay comparable over time. Who it's for - Docs teams shipping content that AI coding assistants retrieve and cite. - Marketing and product pages whose biggest source of referrals is about to be agents, not search. - Engineers debugging why their content shows up wrong in LLM answers. - Anyone who wants to run the same open-source audit a14y.dev runs from the CLI, but without leaving the browser. Privacy Every audit runs in your browser — the URLs you enter and the pages the crawler fetches stay on your machine. a14y collects anonymous usage data by default (audit started/completed events with bucketed score and duration; never URLs, page content, or per-check details) to help us improve the extension. You can turn it off in the extension's options. Full policy: https://a14y.dev/privacy/ Open source Spec, scorecard, and tools live at https://github.com/timothyjordan/a14y. The same scoring engine powers the `a14y` CLI on npm and this extension — same URL + same scorecard version = same score, every time.