What this does
Paste a color as hex, rgb(), hsl(), or a CSS named color, and see it converted to Hex, RGB, HSL, OKLCH, OKLAB, and LAB at once. The contrast checker computes the WCAG relative-luminance contrast ratio between a foreground and background color and shows whether it passes the AA and AAA thresholds for normal and large text.
Privacy
This runs entirely in your browser. Nothing is uploaded.