#331F9B#331F9B

#331F9B is a dark, vivid blue. Relative luminance 0.041; OKLCH L 36.4% C 0.186 H 279.2°. Best body text is #FFFFFF at 11.60:1 contrast (WCAG AA passes).

Color values

HEX	#331F9B
RGB	rgb(51, 31, 155)
HSL	hsl(250, 67%, 36%)
HSV	hsv(250, 80%, 61%)
CMYK	cmyk(67.1%, 80%, 0%, 39.2%)
CIE-LAB	lab(23.84, 45.30, -63.42)
CIE-LCH	lch(23.84, 77.94, 305.54°)
OKLab	oklab(36.36% 0.0296 -0.1831)
OKLCH	oklch(36.36% 0.186 279.2)
XYZ	xyz(7.7697, 4.0497, 31.3762)
Luminance	0.0405 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#331F9B #879B1F

analogous

#1F499B #331F9B #711F9B

triadic

#331F9B #9B331F #1F9B33

tetradic

#331F9B #9B1F49 #879B1F #1F9B71

square

#331F9B #9B1F49 #879B1F #1F9B71

split-complementary

#331F9B #9B711F #499B1F

monochromatic

#110B35 #221568 #331F9B #4429CE #6D57DD

Accessibility & contrast

On white

11.60

#331F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#331F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #331F9B

11.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##331F9B	#FFFFFF	#000000	##FFFFFF
##331F9B	1.00	11.60	1.81	11.60
#FFFFFF	11.60	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D9E

Deuteranopia (green-blind)

#003499

Tritanopia (blue-blind)

#00445D

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #331f9b;
/* rgb */ color: rgb(51, 31, 155);
/* oklch */ color: oklch(36.4% 0.186 279.2);

Tailwind

colors: {
  custom: {
    50: '#7a5fba',
    500: '#331f9b',
    950: '#000000',
  },
}

SCSS

$custom: #331f9b;
$custom-light: #7a5fba;
$custom-dark: #000000;

JSON

{
  "hex": "#331f9b",
  "rgb": {
    "r": 51,
    "g": 31,
    "b": 155
  },
  "hsl": {
    "h": 249.677,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.36358,
    "c": 0.18551,
    "h": 279.2
  },
  "luminance": 0.0405
}

Semantic roles & 50–950 ramp

primary

#331F9B

secondary

#B0C155

accent

#EA3ECE

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0B0512

muted

#7C7981

Preview Lab

Preview with #331F9B

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

Preview Lab → · Contrast checker → · Palette generator →