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Button Contrast Checker vs Accessibility Insights: catalog facts
Button Contrast Checker	Accessibility Insights
Free Free to use.	Free Free and open source, published by Microsoft.
Web	Windows, Browser extension
Tests all buttons and links on a page at once Checks default, hover and focus states	FastPass catches common issues in a few minutes Guided assessment against WCAG 2.1 AA
Only checks buttons and links, not all text on the page Needs a publicly reachable webpage to scan	Web extension targets Chrome and Edge only Desktop tool is Windows only
Web application	Downloadable app, Browser extension
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.