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Color contrast checker

Check that text is readable on its background, with a fix when it is not.
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.

More color tools

- Color converter & contrast (/color/converter)
- Color blindness simulator (/color/blindness)
All color tools (/color)

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