practice
Contrast Ratio
Contrast ratio is the numeric comparison of luminance between two colours — calculated via WCAG's luminance formula — used to evaluate text legibility against its background; WCAG 1.4.3 at Level AA requires 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold).
About Contrast Ratio
Tools: WebAIM Contrast Checker, axe DevTools, browser DevTools, and Figma plugins. APCA (Accessible Perceptual Contrast Algorithm) is being explored as an alternative for WCAG 3.0.
Where Contrast Ratio appears in a AccessivePath audit
Our AI auditors test concepts like Contrast Ratio as part of the WCAG 2.2 Level AA audit cycle — both via automated rule scanning and through screen-reader simulation and human pair review.
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