General skillFrontend development

apca-contrast-skill

Measure perceptual contrast in Tailwind and shadcn design tokens

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License
MIT
Updated
Updated May 1, 2026

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Project overview

apca-contrast-skill bundles a deterministic Python implementation of APCA-W3 that measures Lc for text and background pairs, looks up passing font sizes and weights, audits Tailwind v4 light and dark tokens, and reverse-solves a color for a target Lc. It accepts common CSS color notations and needs no third-party Python package. APCA is still a WCAG 3 draft model, so legal accessibility work also needs a WCAG 2.x ratio check; alpha, wide-gamut displays, typography, and vision conditions need additional judgment.

Repository facts

Primary language
Python
License
MIT
Repository updated
May 1, 2026
Default branch
main

Resource types

General skill

Use cases

Frontend developmentDesign and creative work

Platforms

Claude Code, Codex, and more

Capabilities

Verification and evals

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