What Goes With Indigo?

Why These Colors Work With Indigo

Indigo (#4B0082) sits at 275°, between blue and violet, at full saturation but a very dark 25% lightness — dark enough that it's frequently mistaken for black or navy in low light, which is historically accurate to the actual dye: natural indigo (from Indigofera plants) was prized precisely because it produced this kind of deep, near-black blue that held color through repeated washing, which is why it became the default denim dye worldwide. Its complement falls in yellow-orange territory, and indigo-and-mustard is a pairing with real textile precedent (Japanese boro and shibori work, contemporary denim branding) rather than being a purely theoretical wheel relationship. Indigo against white is crisp and graphic; against warm neutrals like tan or rust it leans into its denim/workwear heritage explicitly. Because it's this dark, indigo functions well as a near-black substitute in interfaces that want a cooler, less severe dark mode than pure black provides — many dark-mode UI palettes are built on an indigo-family base for exactly this reason, trading black's starkness for a subtler cool undertone.