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