Compare software

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