complementary-color
Just add a color and you will get a object with the complementary color in the provided format and a hexref with the hex format of the complementary color (for display purpaces).
xolor
Color manipulation library
@phun-ky/moebius
@phun-ky/moebius is a versatile JavaScript library that automatically generates visually pleasing and customizable color palettes from a given base color. Whether you're building data visualizations, UIs, or design systems, Möbius offers various harmony m
lumino
A simple library for handling conversion of color models (such as rgb, rgba, hex, hsl, etc) and generating different color harmonies (such as complementary, monochromatic, etc).