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Color Contrast Checker: WCAG AA, AAA, and APCA

WCAG AA/AAA and APCA contrast for a color pair, with sample text, swap, alpha flattening, a nearest passing fix, and a share URL.
WCAG 2.x + APCA · alpha composited over the background before measuring · the pair rides the URLClearText colorBackgroundSwapFlatten alpha over background

That color could not be parsed.

Fix both colors to measure.

Fix both colors to preview text.

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Canonical HTML: https://nutter.tools/color/contrast
Markdown version: https://nutter.tools/color/contrast/index.md
Plain-text version: https://nutter.tools/color/contrast/index.txt
Agent index: https://nutter.tools/llms.txt