#3737BB#3737BB

#3737BB is a dark, highly saturated blue. Relative luminance 0.071; OKLCH L 43.3% C 0.200 H 274.2°. Best body text is #FFFFFF at 8.65:1 contrast (WCAG AA passes).

Color values

HEX	#3737BB
RGB	rgb(55, 55, 187)
HSL	hsl(240, 55%, 47%)
HSV	hsv(240, 71%, 73%)
CMYK	cmyk(70.6%, 70.6%, 0%, 26.7%)
CIE-LAB	lab(32.10, 42.85, -69.02)
CIE-LCH	lch(32.10, 81.23, 301.83°)
OKLab	oklab(43.27% 0.0145 -0.1995)
OKLCH	oklch(43.27% 0.2 274.2)
XYZ	xyz(11.9084, 7.1313, 47.7530)
Luminance	0.0713 (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

#3737BB #BBBB37

analogous

#3779BB #3737BB #7937BB

triadic

#3737BB #BB3737 #37BB37

tetradic

#3737BB #BB3779 #BBBB37 #37BB79

square

#3737BB #BB3779 #BBBB37 #37BB79

split-complementary

#3737BB #BB7937 #79BB37

monochromatic

#1B1B5C #29298C #3737BB #5F5FD0 #8E8EDE

Accessibility & contrast

On white

8.65

#3737BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#3737BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737BB

8.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737BB	#FFFFFF	#000000	##FFFFFF
##3737BB	1.00	8.65	2.43	8.65
#FFFFFF	8.65	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BF

Deuteranopia (green-blind)

#0045B9

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3737bb;
/* rgb */ color: rgb(55, 55, 187);
/* oklch */ color: oklch(43.3% 0.200 274.2);

Tailwind

colors: {
  custom: {
    50: '#816fd1',
    500: '#3737bb',
    950: '#000000',
  },
}

SCSS

$custom: #3737bb;
$custom-light: #816fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3737bb",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 187
  },
  "hsl": {
    "h": 240,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.43269,
    "c": 0.20004,
    "h": 274.2
  },
  "luminance": 0.07132
}

Semantic roles & 50–950 ramp

primary

#3737BB

secondary

#C9C985

accent

#DE4ADE

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3737BB

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

Preview Lab → · Contrast checker → · Palette generator →