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Accessibility Insights vs Pa11y: catalog facts
Accessibility Insights	Pa11y
Free Free and open source, published by Microsoft.	Free Free and open source.
Windows, Browser extension	Self-hosted, Command line
FastPass catches common issues in a few minutes Guided assessment against WCAG 2.1 AA	Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds
Web extension targets Chrome and Edge only Desktop tool is Windows only	Automated checks catch only part of all accessibility problems The dashboard requires running your own server
Downloadable app, Browser extension	Downloadable app, Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.