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Stark vs Pa11y: catalog facts
Stark	Pa11y
Freemium Free sign-up available, with paid plans and demos for organisations.	Free Free and open source.
Web, Browser extension	Self-hosted, Command line
Covers design, browser and code stages in one suite Free sign-up for individuals	Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds
Aimed mainly at companies, with advanced features behind sales Requires an account	Automated checks catch only part of all accessibility problems The dashboard requires running your own server
Web application, Hosted service, Browser extension	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License not stated
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 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.