Compare software

Accessibility InsightsButton Contrast Checker
Free

Free and open source, published by Microsoft.

 Free

Free to use.

Windows, Browser extension Web
  • FastPass catches common issues in a few minutes
  • Guided assessment against WCAG 2.1 AA
  • Tests all buttons and links on a page at once
  • Checks default, hover and focus states
  • Web extension targets Chrome and Edge only
  • Desktop tool is Windows only
  • Only checks buttons and links, not all text on the page
  • Needs a publicly reachable webpage to scan
Downloadable app, Browser extension Web application
Open source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Needs internet

Checked September 23, 2026

Checked October 2, 2026

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