Check the pair before anyone struggles to read it
Enter a text colour and a background colour. ContrastKit gives you the WCAG contrast ratio, tells you whether it passes for body text, large text and UI edges, offers the nearest shade of the same hue that would pass, and shows the pair as people with each kind of colour vision see it.
WCAG 2.x relative luminance and contrast ratio. AA is 4.5:1 for body text and 3:1 for large text and UI components; AAA is 7:1 and 4.5:1.
Because a design usually cannot swap hues. ContrastKit moves lightness only, in both directions, and reports whichever passing shade is closest to what you started with.
They use the standard linear approximations that design tools rely on. They are reliable for the question "do these two stay apart", and they are not a medical or diagnostic tool.
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Questions or a pair it judged wrong: app.develop.sk@gmail.com