pick a seed color · get a harmony · check WCAG contrast.
contrast against white · #FFFFFF
contrast against black · #000000
preview
WCAG AAA requires 7:1 for body text · AA requires 4.5:1 · AA for large text allows 3:1.
click any swatch to copy its hex. the harmony algorithms use HSL manipulation — analogous shifts ±30°,
complementary flips 180°, triad at 120° intervals, tetrad at 90°.