Colour

Pick a colour, or type one in any format. Everything else follows, including whether it's readable on black and white.

Hex

RGB

HSL

H°

OKLCH

H°

WCAG contrast

On black background

On white background

AA needs 4.5:1 for normal text and 3:1 for large text (18pt+, or 14pt bold). AAA needs 7:1 and 4.5:1.