#3F37BE#3F37BE

#3F37BE is a dark, highly saturated blue. Relative luminance 0.075; OKLCH L 44.1% C 0.202 H 276.8°. Best body text is #FFFFFF at 8.40:1 contrast (WCAG AA passes).

Color values

HEX#3F37BE
RGBrgb(63, 55, 190)
HSLhsl(244, 55%, 48%)
HSVhsv(244, 71%, 75%)
CMYKcmyk(66.8%, 71.1%, 0%, 25.5%)
CIE-LABlab(32.93, 44.76, -69.40)
CIE-LCHlch(32.93, 82.58, 302.82°)
OKLaboklab(44.09% 0.0239 -0.2004)
OKLCHoklch(44.09% 0.202 276.8)
XYZxyz(12.7073, 7.5057, 49.4843)
Luminance0.0751 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3F37BE #B6BE37
analogous
#3772BE #3F37BE #8337BE
triadic
#3F37BE #BE3F37 #37BE3F
tetradic
#3F37BE #BE3772 #B6BE37 #37BE83
square
#3F37BE #BE3772 #B6BE37 #37BE83
split-complementary
#3F37BE #BE8337 #72BE37
monochromatic
#201C5F #2F298F #3F37BE #6861D1 #9590DF

Accessibility & contrast

On white

8.40
#3F37BE on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.50
#3F37BE on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BE
8.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3F37BE#FFFFFF#000000##FFFFFF
##3F37BE1.008.402.508.40
#FFFFFF8.401.0021.001.00
#0000002.5021.001.0021.00
##FFFFFF8.401.0021.001.00

Color blindness preview

Protanopia (red-blind)
#0053C2
Deuteranopia (green-blind)
#0048BC
Tritanopia (blue-blind)
#005C77
Achromatopsia (no color)
#4D4D4D

Design tokens & code

CSS
--color: #3f37be;
/* rgb */ color: rgb(63, 55, 190);
/* oklch */ color: oklch(44.1% 0.202 276.8);
Tailwind
colors: {
  custom: {
    50: '#856fd3',
    500: '#3f37be',
    950: '#000000',
  },
}
SCSS
$custom: #3f37be;
$custom-light: #856fd3;
$custom-dark: #000000;
JSON
{
  "hex": "#3f37be",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 190
  },
  "hsl": {
    "h": 243.556,
    "s": 55.102,
    "l": 48.039
  },
  "oklch": {
    "l": 0.44089,
    "c": 0.20187,
    "h": 276.8
  },
  "luminance": 0.07507
}

Semantic roles & 50–950 ramp

primary
#3F37BE
secondary
#C6CA87
accent
#DE49D6
background
#F8F6FD
surface
#F0ECFA
border
#CBC7D3
text
#0C0714
muted
#7D7A83

Preview Lab

Preview with #3F37BE

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →

#3F37BE Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva