Radiant Aqua Signal

#21f2e4

Notes

Radiant Aqua Signal (#21F2E4) is a true cyan with a neon character. It sits at the high-saturation edge of its family. Use it sparingly, as signage, accent, or highlight against darker surfaces. Its HSL profile (176°, 89%, 54%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. For a confident two-color system, pair it with its complementary red. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX

#21f2e4

RGB

rgb(33, 242, 228)

HSL

hsl(176, 89%, 54%)