#3739B8#3739B8

#3739B8 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.3% C 0.194 H 274.0°. Best body text is #FFFFFF at 8.61:1 contrast (WCAG AA passes).

Color values

HEX#3739B8
RGBrgb(55, 57, 184)
HSLhsl(239, 54%, 47%)
HSVhsv(239, 70%, 72%)
CMYKcmyk(70.1%, 69%, 0%, 27.8%)
CIE-LABlab(32.25, 40.65, -67.00)
CIE-LCHlch(32.25, 78.36, 301.25°)
OKLaboklab(43.29% 0.0137 -0.1936)
OKLCHoklch(43.29% 0.194 274)
XYZxyz(11.6875, 7.1981, 46.1115)
Luminance0.0720 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3739B8 #B8B637
analogous
#377AB8 #3739B8 #7637B8
triadic
#3739B8 #B83739 #39B837
tetradic
#3739B8 #B8377A #B8B637 #37B876
square
#3739B8 #B8377A #B8B637 #37B876
split-complementary
#3739B8 #B87637 #7AB837
monochromatic
#1B1C5A #292A89 #3739B8 #5D5FCF #8D8EDD

Accessibility & contrast

On white

8.61
#3739B8 on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.44
#3739B8 on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739B8
8.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3739B8#FFFFFF#000000##FFFFFF
##3739B81.008.612.448.61
#FFFFFF8.611.0021.001.00
#0000002.4421.001.0021.00
##FFFFFF8.611.0021.001.00

Color blindness preview

Protanopia (red-blind)
#0052BC
Deuteranopia (green-blind)
#0046B6
Tritanopia (blue-blind)
#005C74
Achromatopsia (no color)
#4C4C4C

Design tokens & code

CSS
--color: #3739b8;
/* rgb */ color: rgb(55, 57, 184);
/* oklch */ color: oklch(43.3% 0.194 274.0);
Tailwind
colors: {
  custom: {
    50: '#8070ce',
    500: '#3739b8',
    950: '#000000',
  },
}
SCSS
$custom: #3739b8;
$custom-light: #8070ce;
$custom-dark: #000000;
JSON
{
  "hex": "#3739b8",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 184
  },
  "hsl": {
    "h": 239.07,
    "s": 53.975,
    "l": 46.863
  },
  "oklch": {
    "l": 0.4329,
    "c": 0.19411,
    "h": 274
  },
  "luminance": 0.07199
}

Semantic roles & 50–950 ramp

primary
#3739B8
secondary
#C7C684
accent
#DB4ADD
background
#F8F6FC
surface
#F0ECF9
border
#CBC7D2
text
#0C0714
muted
#7D7A82

Preview Lab

Preview with #3739B8

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

Preview Lab → · Contrast checker → · Palette generator →

#3739B8 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva