#3737B9#3737B9

#3737B9 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 43.1% C 0.198 H 274.3°. Best body text is #FFFFFF at 8.72:1 contrast (WCAG AA passes).

Color values

HEX#3737B9
RGBrgb(55, 55, 185)
HSLhsl(240, 54%, 47%)
HSVhsv(240, 70%, 73%)
CMYKcmyk(70.3%, 70.3%, 0%, 27.5%)
CIE-LABlab(31.91, 42.18, -68.15)
CIE-LCHlch(31.91, 80.15, 301.75°)
OKLaboklab(43.07% 0.0148 -0.197)
OKLCHoklch(43.07% 0.198 274.3)
XYZxyz(11.6958, 7.0463, 46.6332)
Luminance0.0705 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3737B9 #B9B937
analogous
#3778B9 #3737B9 #7837B9
triadic
#3737B9 #B93737 #37B937
tetradic
#3737B9 #B93778 #B9B937 #37B978
square
#3737B9 #B93778 #B9B937 #37B978
split-complementary
#3737B9 #B97837 #78B937
monochromatic
#1B1B5B #29298A #3737B9 #5E5ECF #8D8DDD

Accessibility & contrast

On white

8.72
#3737B9 on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.41
#3737B9 on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737B9
8.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3737B9#FFFFFF#000000##FFFFFF
##3737B91.008.722.418.72
#FFFFFF8.721.0021.001.00
#0000002.4121.001.0021.00
##FFFFFF8.721.0021.001.00

Color blindness preview

Protanopia (red-blind)
#0051BD
Deuteranopia (green-blind)
#0045B7
Tritanopia (blue-blind)
#005B74
Achromatopsia (no color)
#4B4B4B

Design tokens & code

CSS
--color: #3737b9;
/* rgb */ color: rgb(55, 55, 185);
/* oklch */ color: oklch(43.1% 0.198 274.3);
Tailwind
colors: {
  custom: {
    50: '#806fcf',
    500: '#3737b9',
    950: '#000000',
  },
}
SCSS
$custom: #3737b9;
$custom-light: #806fcf;
$custom-dark: #000000;
JSON
{
  "hex": "#3737b9",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 185
  },
  "hsl": {
    "h": 240,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.43073,
    "c": 0.19755,
    "h": 274.3
  },
  "luminance": 0.07047
}

Semantic roles & 50–950 ramp

primary
#3737B9
secondary
#C8C884
accent
#DE4ADE
background
#F8F6FC
surface
#F0ECF9
border
#CBC7D2
text
#0C0714
muted
#7D7A82

Preview Lab

Preview with #3737B9

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

Preview Lab → · Contrast checker → · Palette generator →

#3737B9 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva