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Stark vs IBM Equal Access Accessibility Checker: catalog facts
Stark	IBM Equal Access Accessibility Checker
Freemium Free sign-up available, with paid plans and demos for organisations.	Free Free and open source, published by IBM on GitHub.
Web, Browser extension	Browser extension, Command line
Covers design, browser and code stages in one suite Free sign-up for individuals	Same rule engine in the browser and in automated builds Integrations for Cypress, Karma, Vitest and Java
Aimed mainly at companies, with advanced features behind sales Requires an account	Automated checks cannot catch every accessibility problem Build integrations need some setup in a test suite
Web application, Hosted service, Browser extension	Downloadable app, Browser extension
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is 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.