Top 3 color-contrast-checker open source projects

Sketch Plugin to check and adjust color contrast accessibility with live preview and sliders. Endorsed by Sketch.

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.

A Sketch plugin that let’s you test an entire color palette against the WCAG 2.0 contrast guidelines.