Tool · Contrast checker
Contrast checker — WCAG + APCA.
Check both standards in a single view. The proposed WCAG 3 algorithm (APCA) sits next to the legal-today WCAG 2 ratio so you can see when they disagree.
Body text — 16px regular
Large text — 24px regular
Bold heading — 24px bold
WCAG 2 contrast ratio
18.19:1
APCA Lc
102
WCAG AA — body text✓ Pass
WCAG AA — large text / UI✓ Pass
WCAG AAA — body text✓ Pass
WCAG AAA — large text✓ Pass
APCA — body text (|Lc| ≥ 75)✓ Pass
APCA — large text (|Lc| ≥ 60)✓ Pass
WCAG 2.x uses a luminance ratio (1:1 to 21:1). APCA (proposed for WCAG 3) accounts for perceptual contrast and direction (light-on-dark vs. dark-on-light). Both are shown — APCA is more accurate for modern screens but not yet a legal standard.