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axe DevTools vs AChecker: catalog facts
axe DevTools	AChecker
Freemium The browser extension has a free tier; wider toolkits are paid and sold through Deque.	Free Single checks are free; automatic monitoring is a paid ACHECKS subscription.
Web, Browser extension	Web
Built on the widely used axe-core rules engine Checks run directly in the browser on the current page	Checks by URL, file upload or pasted HTML Choice of several guideline sets and levels
Automated checks do not replace manual accessibility testing Advanced features are enterprise products sold through sales	Guidelines stop at WCAG 2.0 Older interface with limited explanation of fixes
Hosted service, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
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.