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webhint vs Pa11y: catalog facts
webhint	Pa11y
Free Free open-source project hosted by the OpenJS Foundation.	Free Free and open source.
Browser extension, Command line	Self-hosted, Command line
Same checks available in the editor, the browser and CI Built into Microsoft Edge DevTools	Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds
The CLI requires Node.js and npx Aimed at developers rather than site owners who want a one-click report	Automated checks catch only part of all accessibility problems The dashboard requires running your own server
Downloadable app, Browser extension	Downloadable app, Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	No account 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.