#3737B5#3737B5

#3737B5 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.7% C 0.193 H 274.6°. Best body text is #FFFFFF at 8.84:1 contrast (WCAG AA passes).

Color values

HEX#3737B5
RGBrgb(55, 55, 181)
HSLhsl(240, 53%, 46%)
HSVhsv(240, 70%, 71%)
CMYKcmyk(69.6%, 69.6%, 0%, 29%)
CIE-LABlab(31.53, 40.83, -66.40)
CIE-LCHlch(31.53, 77.95, 301.59°)
OKLaboklab(42.68% 0.0153 -0.1919)
OKLCHoklch(42.68% 0.193 274.6)
XYZxyz(11.2795, 6.8797, 44.4406)
Luminance0.0688 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3737B5 #B5B537
analogous
#3776B5 #3737B5 #7637B5
triadic
#3737B5 #B53737 #37B537
tetradic
#3737B5 #B53776 #B5B537 #37B576
square
#3737B5 #B53776 #B5B537 #37B576
split-complementary
#3737B5 #B57637 #76B537
monochromatic
#1A1A57 #292986 #3737B5 #5C5CCD #8B8BDC

Accessibility & contrast

On white

8.84
#3737B5 on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.38
#3737B5 on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737B5
8.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3737B5#FFFFFF#000000##FFFFFF
##3737B51.008.842.388.84
#FFFFFF8.841.0021.001.00
#0000002.3821.001.0021.00
##FFFFFF8.841.0021.001.00

Color blindness preview

Protanopia (red-blind)
#0050B9
Deuteranopia (green-blind)
#0044B3
Tritanopia (blue-blind)
#005972
Achromatopsia (no color)
#4A4A4A

Design tokens & code

CSS
--color: #3737b5;
/* rgb */ color: rgb(55, 55, 181);
/* oklch */ color: oklch(42.7% 0.193 274.6);
Tailwind
colors: {
  custom: {
    50: '#7f6fcc',
    500: '#3737b5',
    950: '#000000',
  },
}
SCSS
$custom: #3737b5;
$custom-light: #7f6fcc;
$custom-dark: #000000;
JSON
{
  "hex": "#3737b5",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 181
  },
  "hsl": {
    "h": 240,
    "s": 53.39,
    "l": 46.275
  },
  "oklch": {
    "l": 0.42684,
    "c": 0.19251,
    "h": 274.6
  },
  "luminance": 0.06881
}

Semantic roles & 50–950 ramp

primary
#3737B5
secondary
#C6C682
accent
#DD4BDD
background
#F8F6FC
surface
#F0ECF9
border
#CBC7D2
text
#0C0714
muted
#7D7A82

Preview Lab

Preview with #3737B5

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

Preview Lab → · Contrast checker → · Palette generator →

#3737B5 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva