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APCA git.apcacontrast.com ↗

Advanced Perceptual Contrast Algorithm for measuring text readability, proposed for WCAG 3.

OtherDesign & mediaaccessibilitycontrastwcag

Screenshot of git.apcacontrast.com, APCA's site

Captured 3 Nov 2026

Recommended in 1 thread

Safari introduces Adaptive Dark Mode in 27.3
webkit.org · 10 days ago
More accurate than WCAG 2 contrast ratios for light-on-dark text.

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Link from a commenter, not checked or endorsed by us: ↗ https://git.apcacontrast.com/documentation/APCAeasyIntro.html