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Pa11y vs Stark: catalog facts
Pa11y	Stark
Free Free and open source.	Freemium Free sign-up available, with paid plans and demos for organisations.
Self-hosted, Command line	Web, Browser extension
Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds	Covers design, browser and code stages in one suite Free sign-up for individuals
Automated checks catch only part of all accessibility problems The dashboard requires running your own server	Aimed mainly at companies, with advanced features behind sales Requires an account
Downloadable app, Self-hosted	Web application, Hosted service, Browser extension
Open source	Closed source
License not stated	License not stated
No account needed	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.