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Sa11y vs axe DevTools: catalog facts
Sa11y	axe DevTools
Free Free and open source.	Freemium The browser extension has a free tier; wider toolkits are paid and sold through Deque.
Web, Self-hosted	Web, Browser extension
Shows issues in place with plain fix instructions Over 80 checks with rules you can switch off	Built on the widely used axe-core rules engine Checks run directly in the browser on the current page
Aimed at content issues, not a full code audit Needs to be added to a site or CMS by a developer	Automated checks do not replace manual accessibility testing Advanced features are enterprise products sold through sales
Self-hosted	Hosted service, Browser extension
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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