Compare software

Contrast FinderContrast Ratio
Free

Free to use online and open source for self-hosting.

 Free

Free to use in the browser.

Web, Self-hosted Web
  • Suggests valid colors close to the original
  • Choose to adjust text or background color
  • Updates the ratio live as you type
  • Handles semi-transparent colors with an error margin
  • Checks one color pair at a time
  • Focused only on contrast, not other accessibility criteria
  • Checks one color pair at a time
  • The hosting page includes marketing content from Siege Media
Web application, Self-hosted Web application
Open source Closed source
License: AGPL-3.0 License not stated
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 23, 2026

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