Colorable takes a set of colors and calculates contrast values for every possible pairing, flagging which combinations pass WCAG AA, AA Large, AAA, and AAA Large.
Testing every combination in a palette at once, rather than checking pairs individually, surfaces the specific pairings worth avoiding in a real interface where colors get combined in ways not always anticipated during palette selection.
Design system teams validating an entire color palette at once, since it's also available as a JavaScript library for automating the check in a build pipeline.
The JS library version is worth using over the web app for a design system, since contrast checks can then run automatically whenever the palette changes instead of needing a manual recheck.
Test colour combinations for accessibility before you ship them.
