#3137BB#3137BB

#3137BB is a dark, highly saturated blue. Relative luminance 0.070; OKLCH L 42.9% C 0.202 H 272.2°. Best body text is #FFFFFF at 8.77:1 contrast (WCAG AA passes).

Color values

HEX	#3137BB
RGB	rgb(49, 55, 187)
HSL	hsl(237, 58%, 46%)
HSV	hsv(237, 74%, 73%)
CMYK	cmyk(73.8%, 70.6%, 0%, 26.7%)
CIE-LAB	lab(31.74, 42.22, -69.62)
CIE-LCH	lch(31.74, 81.42, 301.23°)
OKLab	oklab(42.91% 0.0076 -0.2014)
OKLCH	oklch(42.91% 0.202 272.2)
XYZ	xyz(11.5994, 6.9720, 47.7385)
Luminance	0.0697 (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

#3137BB #BBB531

analogous

#317CBB #3137BB #7031BB

triadic

#3137BB #BB3137 #37BB31

tetradic

#3137BB #BB317C #BBB531 #31BB70

square

#3137BB #BB317C #BBB531 #31BB70

split-complementary

#3137BB #BB7031 #7CBB31

monochromatic

#181A5A #24298B #3137BB #565CD3 #878BE0

Accessibility & contrast

On white

8.77

#3137BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#3137BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3137BB

8.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3137BB	#FFFFFF	#000000	##FFFFFF
##3137BB	1.00	8.77	2.39	8.77
#FFFFFF	8.77	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051BF

Deuteranopia (green-blind)

#0044B9

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3137bb;
/* rgb */ color: rgb(49, 55, 187);
/* oklch */ color: oklch(42.9% 0.202 272.2);

Tailwind

colors: {
  custom: {
    50: '#7e6fd1',
    500: '#3137bb',
    950: '#000000',
  },
}

SCSS

$custom: #3137bb;
$custom-light: #7e6fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3137bb",
  "rgb": {
    "r": 49,
    "g": 55,
    "b": 187
  },
  "hsl": {
    "h": 237.391,
    "s": 58.475,
    "l": 46.275
  },
  "oklch": {
    "l": 0.42914,
    "c": 0.20158,
    "h": 272.2
  },
  "luminance": 0.06973
}

Semantic roles & 50–950 ramp

primary

#3137BB

secondary

#C9C67F

accent

#DB46E2

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3137BB

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

Preview Lab → · Contrast checker → · Palette generator →