WeVividWeVividPick a base colour and get complementary, analogous, triadic, split-complementary, square and monochromatic palette suggestions.
Complementary uses opposite hues for high contrast; analogous uses nearby hues for harmony; triadic and square use evenly spaced hues for vibrant variety; monochromatic varies only lightness for a subtle look.
Analogous or monochromatic palettes usually feel calmer for UI backgrounds; complementary is good for a single strong accent against a neutral base.