Color Contrast

Color Contrast Ratio

Color contrast is the numerical ratio of luminance between text and background. WCAG 2.1 Level AA requires a minimum of 4.5:1 for normal text and 3:1 for large text (>18pt or >14pt bold). Level AAA: 7:1 and 4.5:1. Low contrast is the most common error: 81% of sites have this issue (WebAIM).