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AChecker vs Pa11y: catalog facts
AChecker	Pa11y
Free Single checks are free; automatic monitoring is a paid ACHECKS subscription.	Free Free and open source.
Web	Self-hosted, Command line
Checks by URL, file upload or pasted HTML Choice of several guideline sets and levels	Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds
Guidelines stop at WCAG 2.0 Older interface with limited explanation of fixes	Automated checks catch only part of all accessibility problems The dashboard requires running your own server
Web application	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License not stated
No account needed	No account 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.