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Sa11y vs ARC Toolkit: catalog facts
Sa11y	ARC Toolkit
Free Free and open source.	Free Free to install from the Chrome Web Store.
Web, Self-hosted	Browser extension
Shows issues in place with plain fix instructions Over 80 checks with rules you can switch off	Runs inside the browser on the current page Uses TPGi's ARC rules engine
Aimed at content issues, not a full code audit Needs to be added to a site or CMS by a developer	Checks one page at a time Automated checks do not replace manual testing
Self-hosted	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.