Lea Verou's Contrast Ratio computes the exact WCAG ratio between two colors and handles semi-transparent values correctly. A precise, no-nonsense checker for tricky cases.
Preview
contrast-ratio.com
Ratio output
Why we like it
Handles alpha transparency
Exact WCAG ratio
Simple and fast
Related resources
Freemium
axe DevTools
Industry-standard accessibility testing in DevTools.
