WCAG contrast checker

Check readable foreground and background pairs.

Measure contrast ratio, normal text, large text, and UI-state thresholds with deterministic color math and clear pass/fail results.

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Free color utility

Contrast

Inputs update live, exports are copy-ready, and the color math stays deterministic.

Accessibility

Contrast pair

AA

Accessible color decisions Sample body text on the selected background.

How it fits

From color value to usable system.

Hue Codex treats each color as part of a larger workflow: conversion, accessibility, palette roles, CSS syntax, shareable URLs, and production exports.

Deterministic math

Color conversion follows CSS Color 4 conventions, including D50 Lab/LCH, D65 OKLab/OKLCH, and WCAG 2.2 contrast thresholds.

Readable outputs

Every result is formatted for designers, developers, search engines, and assistive technology.

Free sharing

Palette URLs can be bookmarked and sent without an account, making early color decisions easy to revisit.