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Apps / Ratio

Ratio

Validate color contrast

Mark Wyner ✓ Verified

com.markwyner.ratio
View on Flathub ↗

Ratio uses WCAG algorithms to validate color contrast for accessibility. Specifically for the WCAG Success criteria 1.4.3 (text), 1.4.11 (non-text elements), and 2.4.13 (focus appearance). I made it for myself, but it is also my gift to you. (There’s also a macOS version available.)

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Screenshots

The main screen where colors are selected and tested.
The main screen where colors are selected and tested.
A simple info screen.
A simple info screen.

Observed history

App ChangeVersionWhen ↓
updated1.0.67 Oct 2026
new1.0.626 Sept 2026

Upstream releases

Release notes supplied by the developer. These dates are not Flathub package publication times.

1.0.66 Oct 2026
  • Updated GTK4 window chrome to libadwaita
  • Updated app icon and summary for improved Flathub listing
  • Updated screenshots for Flathub listing
1.0.51 Oct 2026
  • New app icon and symbolic icon (thank you, Hylke Bons!)
  • Flathub listing updates: simplified summary and branding colors added
1.0.426 Sept 2026

First release for Linux