Hue relationships use the HSL wheel: complementary +180°, analogous ±30°, split +150°/+210°, triadic +120°/+240°, tetradic 0°/60°/180°/240°. They offer possibilities, not guarantees of harmony.

Monochromatic holds hue and saturation with a contained lightness range around the base. Nearby colors follow a narrow hue progression, or lightness for near-neutrals. These are HSL steps, not perceptually equal distances. Shades, tints and tones mix sRGB values toward black, white and #808080 gray. Shade and tint rows stop one original step before black and white, redistributing seven stops evenly across the smaller range. Very dark or light inputs may still round to an endpoint. Rounded duplicates are omitted. Near-neutral colors are offered without hue harmonies. Names follow standard web-color values and appear only for exact matches. Color inputs become solid sRGB swatches; opacity is ignored. Wider-gamut inputs are converted to sRGB.