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List of Contrast Checkers

WCAG 2.1 contrast checkers

These testers use the current WCAG 2.1 and lower formulas for determining if a color matches the 3:1 or 4.5:1 contrast ratios outlined in the guidelines.

APCA Contrast Testers

These testers use the Advanced Perception of Color Algorithm to determine if colors pass. Note that APCA is still being tweaked and won’t be official until at least WCAG 3.0.