#31318B#31318B

#31318B is a dark, vivid blue. Relative luminance 0.047; OKLCH L 37.3% C 0.145 H 276.7°. Best body text is #FFFFFF at 10.81:1 contrast (WCAG AA passes).

Color values

HEX	#31318B
RGB	rgb(49, 49, 139)
HSL	hsl(240, 48%, 37%)
HSV	hsv(240, 65%, 55%)
CMYK	cmyk(64.7%, 64.7%, 0%, 45.5%)
CIE-LAB	lab(25.90, 29.21, -50.16)
CIE-LCH	lch(25.90, 58.05, 300.21°)
OKLab	oklab(37.32% 0.017 -0.1445)
OKLCH	oklch(37.32% 0.146 276.7)
XYZ	xyz(7.0236, 4.7131, 24.9607)
Luminance	0.0471 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#31318B #8B8B31

analogous

#315E8B #31318B #5E318B

triadic

#31318B #8B3131 #318B31

tetradic

#31318B #8B315E #8B8B31 #318B5E

square

#31318B #8B315E #8B8B31 #318B5E

split-complementary

#31318B #8B5E31 #5E8B31

monochromatic

#111131 #21215E #31318B #4141B8 #6B6BCB

Accessibility & contrast

On white

10.81

#31318B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#31318B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #31318B

10.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##31318B	#FFFFFF	#000000	##FFFFFF
##31318B	1.00	10.81	1.94	10.81
#FFFFFF	10.81	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00418E

Deuteranopia (green-blind)

#003989

Tritanopia (blue-blind)

#004859

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #31318b;
/* rgb */ color: rgb(49, 49, 139);
/* oklch */ color: oklch(37.3% 0.145 276.7);

Tailwind

colors: {
  custom: {
    50: '#7469ae',
    500: '#31318b',
    950: '#000000',
  },
}

SCSS

$custom: #31318b;
$custom-light: #7469ae;
$custom-dark: #000000;

JSON

{
  "hex": "#31318b",
  "rgb": {
    "r": 49,
    "g": 49,
    "b": 139
  },
  "hsl": {
    "h": 240,
    "s": 47.872,
    "l": 36.863
  },
  "oklch": {
    "l": 0.37319,
    "c": 0.1455,
    "h": 276.7
  },
  "luminance": 0.04714
}

Semantic roles & 50–950 ramp

primary

#31318B

secondary

#B2B265

accent

#D750D7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#090610

muted

#7B7A7F

Preview Lab

Preview with #31318B

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

Preview Lab → · Contrast checker → · Palette generator →