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Stark vs Accessibility Insights: catalog facts
Stark	Accessibility Insights
Freemium Free sign-up available, with paid plans and demos for organisations.	Free Free and open source, published by Microsoft.
Web, Browser extension	Windows, Browser extension
Covers design, browser and code stages in one suite Free sign-up for individuals	FastPass catches common issues in a few minutes Guided assessment against WCAG 2.1 AA
Aimed mainly at companies, with advanced features behind sales Requires an account	Web extension targets Chrome and Edge only Desktop tool is Windows only
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.