APCA (Accessible Perceptual Contrast Algorithm) is a new method for predicting contrast for use in emerging web standards (WCAG 3) for determining readability contrast. APCA is derived form the SAPC (S-LUV Advanced Predictive Color) which is an accessibility-oriented color appearance model designed for self-illuminated displays.

The APCA version, to be licensed for use with guidelines: W3/AGWG.

Check the contrast between different colour combinations against WCAG standards

Colority it's a PHP library that allows you to: transform and validate colors, obtain the best contrast color (using contrast ratio from WCAG 2.0 standard), extract colors from images and more.

Inspect the contrast in color combinations, making sure to comply with the accessibility guidelines established by WCAG.

Get the contrast ratio and WCAG score between two colors in order to ensure accessibility

[Mirror] Tempus is a collection of themes for Vim, text editors, and terminal emulators that are compliant at the very least with the WCAG AA accessibility standard for colour contrast

A CLI utility to calculate/verify accessible magic numbers for a color palette.

♿ Accessible pygments themes

Checks the color contrast of your color design based on Web Content Accessibility Guidelines (WCAG)

You pick the colors. We make them readable.

visualizing relative luminance contrast within sRGB colorspace

Core components for iOS and tvOS to accelerate building user interfaces in code.

Omnibus Prime is a classic blog starter theme, made using PUXL framework, tailor-fitted for WordPress. Have your stories accessible, WCAG 2.1 AA compliant with zero effort: color-contrasted, responsive, customizable, human and eco-friendly.

A tool to check for color contrast using APCA

Sass implementation of the Accessible Perceptual Contrast Algorithm (APCA) for the WCAG 3.0 specification.

WCAG accessibility colour contrast checker web extension

WCAG Checker is an open-source tool designed to verify the compliance of websites and PDF files with the Web Content Accessibility Guidelines (WCAG). This project aims to assist developers and designers in ensuring that their websites and PDF documents are accessible to all users, including those with disabilities.

Comprehensive color manipulation library with WCAG compliance, parsing, and format conversion

A desktop app to check color contrasts according to WCAG guidelines