#3137B3#3137B3

#3137B3 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 42.1% C 0.192 H 272.6°. Best body text is #FFFFFF at 9.02:1 contrast (WCAG AA passes).

Color values

HEX	#3137B3
RGB	rgb(49, 55, 179)
HSL	hsl(237, 57%, 45%)
HSV	hsv(237, 73%, 70%)
CMYK	cmyk(72.6%, 69.3%, 0%, 29.8%)
CIE-LAB	lab(30.97, 39.47, -66.15)
CIE-LCH	lch(30.97, 77.03, 300.82°)
OKLab	oklab(42.12% 0.0086 -0.1913)
OKLCH	oklch(42.12% 0.192 272.6)
XYZ	xyz(10.7668, 6.6389, 43.3531)
Luminance	0.0664 (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

#3137B3 #B3AD31

analogous

#3178B3 #3137B3 #6C31B3

triadic

#3137B3 #B33137 #37B331

tetradic

#3137B3 #B33178 #B3AD31 #31B36C

square

#3137B3 #B33178 #B3AD31 #31B36C

split-complementary

#3137B3 #B36C31 #78B331

monochromatic

#171953 #242883 #3137B3 #5257D0 #8286DD

Accessibility & contrast

On white

9.02

#3137B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#3137B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3137B3

9.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3137B3	#FFFFFF	#000000	##FFFFFF
##3137B3	1.00	9.02	2.33	9.02
#FFFFFF	9.02	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FB7

Deuteranopia (green-blind)

#0043B1

Tritanopia (blue-blind)

#005970

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #3137b3;
/* rgb */ color: rgb(49, 55, 179);
/* oklch */ color: oklch(42.1% 0.192 272.6);

Tailwind

colors: {
  custom: {
    50: '#7d6ecb',
    500: '#3137b3',
    950: '#000000',
  },
}

SCSS

$custom: #3137b3;
$custom-light: #7d6ecb;
$custom-dark: #000000;

JSON

{
  "hex": "#3137b3",
  "rgb": {
    "r": 49,
    "g": 55,
    "b": 179
  },
  "hsl": {
    "h": 237.231,
    "s": 57.018,
    "l": 44.706
  },
  "oklch": {
    "l": 0.42124,
    "c": 0.1915,
    "h": 272.6
  },
  "luminance": 0.0664
}

Semantic roles & 50–950 ramp

primary

#3137B3

secondary

#C6C27A

accent

#D948E0

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3137B3

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

Preview Lab → · Contrast checker → · Palette generator →