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color

Contrast

Two colors, the WCAG numbers, and the smallest change that would pass.

Large text, 24px

Bold text, 18.66px

Body text at a normal size: this is the case that actually decides whether a palette is usable.

RequirementNeedsResult

WCAG 2's ratio is a blunt instrument: it systematically over-rates light text on dark backgrounds and under-rates the reverse. It is still what accessibility audits and most legal requirements use, so it is what this tool reports.