#3F00FF · Ultramarine
Click to copy#3F00FF (RGB 63, 0, 255) is a medium, highly saturated blue, closest to Ultramarine and near Neon Blue and Iris. Blue suggests trust, stability and calm; it is the most used hue in corporate and tech branding, which makes #3F00FF a natural choice for links, primary buttons, finance and technology. In OKLCH it has 47% lightness and 0.30 chroma at hue 274°.
Color codes click to copy
HEX
#3F00FFRGB
rgb(63, 0, 255)HSL
hsl(255, 100%, 50%)CMYK
75, 100, 0, 0CSS var
--ultramarineContrast
7.91:1 white · 2.66:1 blackSimilar named colors
How to use #3F00FF
White text passes WCAG AA on #3F00FF (7.91:1); black does not, so keep dark text off it.
For a calm scheme pair #3F00FF with its analogous neighbors #0040FF and #BF00FF; for contrast use its complement #BFFF00 as a small accent, and anchor everything with a neutral such as #F5F5F7.
--ultramarine: #3F00FF;
$ultramarine: #3F00FF;
colors: { 'ultramarine': '#3F00FF' } Color card
