TypeScript definitions for apca-w3

APCA: the Accessible Perceptual Contrast Algorithm, a modern contrast method that improves readability contrast on self-illuminated displays. Developed for the W3C's WCAG 3 and other standards.

Axe rules to check against APCA bronze and silver+ conformance levels.

Sass implementation of the [Accessible Perceptual Contrast Algorithm (APCA)](https://git.apcacontrast.com/) for the WCAG 3.0 specification.

JS color calculator for composing colors with consistent APCA contrast ratio

APCA Lc contrast for a text/background pair. npm @shapea11y.

APCA Lc contrast for a text/background pair. npm @opena11y — not affiliated with OpenA11y on GitHub.

Storybook Accessibility addon with APCA (WCAG 3) support

WCAG 2 and APCA-W3 contrast in one dependency-free module, plus OKLab palette extraction and HEX/RGB/HSL/HSB/CMYK conversion.

Storybook a11y reporter with APCA support for CI/CLI

opena11y CLI — name, tree, hear, headings, focus, apca, skills install. npm @opena11y — not affiliated with OpenA11y on GitHub.

A Bridge for WCAG_2 contrast using APCA (Advanced Perceptual Contrast Algorithm), technology.

CLI for APCA (Lc) accessibility contrast checking — the algorithm WCAG 3 is built around.

shapea11y CLI — name, tree, hear, headings, focus, apca, skills install. npm @shapea11y.

WCAG & APCA contrast ratios for hex and OKLCH colors, plus readableOn, isReadable and score helpers. Part of huekit, the OKLCH toolkit for designers.

APCA (Accessible Perceptual Contrast Algorithm) contrast calculation for @pawells/colors — opt-in W3-licensed accessibility contrast utility, kept separate so the MIT-licensed core package carries no field-of-use restrictions.

MCP server for opena11y name/tree/headings/hear/focus/apca. npm @opena11y — not affiliated with OpenA11y on GitHub.

One color → 150+ design tokens. OKLCH-based theme generator with CSS variables, Tailwind config, DTCG export, APCA contrast, tonal palettes, and color blindness simulation. Zero deps, strict TypeScript.

The Doman Digital house craft standard as numbers: OKLCh colour ramps that snap to existing anchors, derived semantic tokens with measured WCAG and APCA contrast, one shared motion vocabulary for CSS and JS, and a base stylesheet. Zero dependencies.

UI/UX design audit tool for Claude Code. Scores projects across 12 dimensions: color contrast, typography, accessibility, layout, and more. WCAG 2.2, APCA, and OKLCH color science. Zero dependencies.