APCA + WCAG 2 contrast checker

Screenshot of an interface titled “APCA + WCAG 2 Contrast Checker”, showing inputs for foreground and background colors, and results including “WCAG ratio 3.81:1”, “WCAG status Fail”, and “APCA status Fail”.

Mike Gifford’s tool that helps to test and refine color combinations meeting both WCAG 2.x and APCA accessibility requirements. The tool supports modern CSS color formats, provides harmony palette generation, and suggests adjustments to satisfy contrast thresholds.

mgifford.github.io/contrast-plus