Cool Cobalt Opal

#231f9e

Notes

Cool Cobalt Opal (#231F9E) is a true blue with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (242°, 67%, 37%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary yellow. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX

#231f9e

RGB

rgb(35, 31, 158)

HSL

hsl(242, 67%, 37%)