The APCA version, to be licensed for use with guidelines: W3/AGWG.
Some useful resources for web accessibility
A multi-color contrast checker that lets you test colors across multiple backgrounds and UI contexts — not just for WCAG compliance, but for practical, system-wide accessibility.
A tool to help designers and developers choose accessible text and background color combinations that meet WCAG standards.
Create, preview, and share brand typography & color tokens with a friendly contrast checker. Vite/React + Cloudflare Worker/D1.
AI powered WCAG contrast checker that not only detects failures but fixes them for you. Built for developers who want fast, accurate accessibility.
Free WCAG color contrast checker and accessible palette builder. Verify AA/AAA compliance in real-time, simulate color blindness, get accessible color suggestions, and export palettes to CSS, Tailwind, JSON, SCSS, Swift, Android, and Design Tokens.
A modern, all-in-one suite for color generation, contrast checking, and design inspiration.
Add a description, image, and links to the contrast-checker topic page so that developers can more easily learn about it.
To associate your repository with the contrast-checker topic, visit your repo's landing page and select "manage topics."