#3837BB#3837BB

#3837BB is a dark, vivid blue. Relative luminance 0.072; OKLCH L 43.3% C 0.200 H 274.5°. Best body text is #FFFFFF at 8.63:1 contrast (WCAG AA passes).

Color values

HEX	#3837BB
RGB	rgb(56, 55, 187)
HSL	hsl(240, 55%, 47%)
HSV	hsv(240, 71%, 73%)
CMYK	cmyk(70.1%, 70.6%, 0%, 26.7%)
CIE-LAB	lab(32.17, 42.96, -68.91)
CIE-LCH	lch(32.17, 81.20, 301.94°)
OKLab	oklab(43.33% 0.0157 -0.1992)
OKLCH	oklch(43.33% 0.2 274.5)
XYZ	xyz(11.9637, 7.1598, 47.7556)
Luminance	0.0716 (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

#3837BB #BABB37

analogous

#3778BB #3837BB #7A37BB

triadic

#3837BB #BB3837 #37BB38

tetradic

#3837BB #BB3778 #BABB37 #37BB7A

square

#3837BB #BB3778 #BABB37 #37BB7A

split-complementary

#3837BB #BB7A37 #78BB37

monochromatic

#1C1B5C #2A298C #3837BB #605FD0 #8F8EDE

Accessibility & contrast

On white

8.63

#3837BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#3837BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3837BB

8.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3837BB	#FFFFFF	#000000	##FFFFFF
##3837BB	1.00	8.63	2.43	8.63
#FFFFFF	8.63	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BF

Deuteranopia (green-blind)

#0045B9

Tritanopia (blue-blind)

#005B75

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3837bb;
/* rgb */ color: rgb(56, 55, 187);
/* oklch */ color: oklch(43.3% 0.200 274.5);

Tailwind

colors: {
  custom: {
    50: '#816fd1',
    500: '#3837bb',
    950: '#000000',
  },
}

SCSS

$custom: #3837bb;
$custom-light: #816fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3837bb",
  "rgb": {
    "r": 56,
    "g": 55,
    "b": 187
  },
  "hsl": {
    "h": 240.455,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.43332,
    "c": 0.19981,
    "h": 274.5
  },
  "luminance": 0.07161
}

Semantic roles & 50–950 ramp

primary

#3837BB

secondary

#C8C985

accent

#DE4ADD

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3837BB

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

Preview Lab → · Contrast checker → · Palette generator →