Color Contrast Checker - WCAG

Check the WCAG contrast ratio between any two colors and see AA/AAA pass or fail. Pick colors from screen, runs locally.

Guessing whether text is readable enough is risky — WCAG has exact numbers. This checker gives you the contrast ratio between a text colour and a background, and tells you which levels pass. Type a hex value, use the colour picker, or sample any pixel on your screen with the eyedropper. You instantly see the ratio and whether it meets AA and AAA for both normal and large text, with a live preview of the two colours together. Swap text and background with one click. Everything runs in the popup. No account, no upload; the only thing saved is your last two colours. How to use 1. Click the icon. 2. Set the text and background colours — type hex, use the picker, or click the eyedropper to sample the screen. 3. Read the ratio and the AA / AAA pass or fail badges. Features • WCAG 2.1 contrast ratio for any two colours. • AA and AAA results for normal and large text. • Eyedropper to sample any colour on screen. • Live preview and one-click swap. • Runs locally — no login, no servers, no tracking.