#31337B#31337B

#31337B is a dark, moderate blue. Relative luminance 0.045; OKLCH L 36.3% C 0.120 H 277.4°. Best body text is #FFFFFF at 11.11:1 contrast (WCAG AA passes).

Color values

HEX	#31337B
RGB	rgb(49, 51, 123)
HSL	hsl(238, 43%, 34%)
HSV	hsv(238, 60%, 48%)
CMYK	cmyk(60.2%, 58.5%, 0%, 51.8%)
CIE-LAB	lab(25.11, 22.17, -41.43)
CIE-LCH	lch(25.11, 46.99, 298.15°)
OKLab	oklab(36.32% 0.0155 -0.1188)
OKLCH	oklch(36.32% 0.12 277.4)
XYZ	xyz(6.0245, 4.4503, 19.2766)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#31337B #7B7931

analogous

#31587B #31337B #54317B

triadic

#31337B #7B3133 #337B31

tetradic

#31337B #7B3158 #7B7931 #317B54

square

#31337B #7B3158 #7B7931 #317B54

split-complementary

#31337B #7B5431 #587B31

monochromatic

#0E0F23 #20214F #31337B #4245A7 #6567C2

Accessibility & contrast

On white

11.11

#31337B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#31337B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #31337B

11.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##31337B	#FFFFFF	#000000	##FFFFFF
##31337B	1.00	11.11	1.89	11.11
#FFFFFF	11.11	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F7D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#024451

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #31337b;
/* rgb */ color: rgb(49, 51, 123);
/* oklch */ color: oklch(36.3% 0.120 277.4);

Tailwind

colors: {
  custom: {
    50: '#716aa2',
    500: '#31337b',
    950: '#000000',
  },
}

SCSS

$custom: #31337b;
$custom-light: #716aa2;
$custom-dark: #000000;

JSON

{
  "hex": "#31337b",
  "rgb": {
    "r": 49,
    "g": 51,
    "b": 123
  },
  "hsl": {
    "h": 238.378,
    "s": 43.023,
    "l": 33.725
  },
  "oklch": {
    "l": 0.36322,
    "c": 0.11982,
    "h": 277.4
  },
  "luminance": 0.04451
}

Semantic roles & 50–950 ramp

primary

#31337B

secondary

#A9A75F

accent

#CF55D3

background

#F7F6FA

surface

#EDEBF3

border

#C8C6CD

text

#08060F

muted

#7B7A7F

Preview Lab

Preview with #31337B

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

Preview Lab → · Contrast checker → · Palette generator →