#3740BB#3740BB

#3740BB is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.7% C 0.190 H 272.6°. Best body text is #FFFFFF at 8.04:1 contrast (WCAG AA passes).

Color values

HEX	#3740BB
RGB	rgb(55, 64, 187)
HSL	hsl(236, 55%, 47%)
HSV	hsv(236, 71%, 73%)
CMYK	cmyk(70.6%, 65.8%, 0%, 26.7%)
CIE-LAB	lab(34.12, 37.39, -65.71)
CIE-LCH	lch(34.12, 75.60, 299.64°)
OKLab	oklab(44.73% 0.0088 -0.1898)
OKLCH	oklch(44.73% 0.19 272.6)
XYZ	xyz(12.3756, 8.0657, 47.9087)
Luminance	0.0807 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3740BB #BBB237

analogous

#3782BB #3740BB #7037BB

triadic

#3740BB #BB3740 #40BB37

tetradic

#3740BB #BB3782 #BBB237 #37BB70

square

#3740BB #BB3782 #BBB237 #37BB70

split-complementary

#3740BB #BB7037 #82BB37

monochromatic

#1B205C #29308C #3740BB #5F67D0 #8E94DE

Accessibility & contrast

On white

8.04

#3740BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.61

#3740BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3740BB

8.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3740BB	#FFFFFF	#000000	##FFFFFF
##3740BB	1.00	8.04	2.61	8.04
#FFFFFF	8.04	1.00	21.00	1.00
#000000	2.61	21.00	1.00	21.00
##FFFFFF	8.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BF

Deuteranopia (green-blind)

#004AB9

Tritanopia (blue-blind)

#006078

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3740bb;
/* rgb */ color: rgb(55, 64, 187);
/* oklch */ color: oklch(44.7% 0.190 272.6);

Tailwind

colors: {
  custom: {
    50: '#8075d1',
    500: '#3740bb',
    950: '#000000',
  },
}

SCSS

$custom: #3740bb;
$custom-light: #8075d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3740bb",
  "rgb": {
    "r": 55,
    "g": 64,
    "b": 187
  },
  "hsl": {
    "h": 235.909,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44727,
    "c": 0.19004,
    "h": 272.6
  },
  "luminance": 0.08067
}

Semantic roles & 50–950 ramp

primary

#3740BB

secondary

#C9C485

accent

#D44ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3740BB

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

Preview Lab → · Contrast checker → · Palette generator →