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AChecker vs ARC Toolkit: catalog facts
AChecker	ARC Toolkit
Free Single checks are free; automatic monitoring is a paid ACHECKS subscription.	Free Free to install from the Chrome Web Store.
Web	Browser extension
Checks by URL, file upload or pasted HTML Choice of several guideline sets and levels	Runs inside the browser on the current page Uses TPGi's ARC rules engine
Guidelines stop at WCAG 2.0 Older interface with limited explanation of fixes	Checks one page at a time Automated checks do not replace manual testing
Web application	Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	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.