About
About a11ycontrast
A free contrast auditor that checks your entire palette against WCAG 2.2 and APCA — and suggests the nearest accessible fix — all in your browser.
Most checkers test one foreground-on-background pair at a time. Real design systems have a dozen colors, and the failing combinations are the ones nobody thought to check. a11ycontrast builds the full matrix — every color as text on every other color as background — scored with both the WCAG 2.2 ratio and APCA Lc, and computes the nearest accessible color for each failure.
There’s no backend: your colors are parsed and scored locally and never leave your device.