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