#231B64#231B64

#231B64 is a dark, vivid blue. Relative luminance 0.021; OKLCH L 28.6% C 0.122 H 280.3°. Best body text is #FFFFFF at 14.87:1 contrast (WCAG AA passes).

Color values

HEX	#231B64
RGB	rgb(35, 27, 100)
HSL	hsl(247, 57%, 25%)
HSV	hsv(247, 73%, 39%)
CMYK	cmyk(65%, 73%, 0%, 60.8%)
CIE-LAB	lab(15.80, 27.41, -41.78)
CIE-LCH	lch(15.80, 49.97, 303.27°)
OKLab	oklab(28.59% 0.0218 -0.1204)
OKLCH	oklch(28.59% 0.122 280.3)
XYZ	xyz(3.3846, 2.0610, 12.2736)
Luminance	0.0206 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B64 #5C641B

analogous

#1B3864 #231B64 #471B64

triadic

#231B64 #64231B #1B6423

tetradic

#231B64 #641B38 #5C641B #1B6447

square

#231B64 #641B38 #5C641B #1B6447

split-complementary

#231B64 #64471B #38641B

monochromatic

#080718 #120E34 #231B64 #342894 #4535C4

Accessibility & contrast

On white

14.87

#231B64 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.41

#231B64 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B64

14.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B64	#FFFFFF	#000000	##FFFFFF
##231B64	1.00	14.87	1.41	14.87
#FFFFFF	14.87	1.00	21.00	1.00
#000000	1.41	21.00	1.00	21.00
##FFFFFF	14.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002A66

Deuteranopia (green-blind)

#002563

Tritanopia (blue-blind)

#002E3D

Achromatopsia (no color)

#272727

Design tokens & code

CSS

--color: #231b64;
/* rgb */ color: rgb(35, 27, 100);
/* oklch */ color: oklch(28.6% 0.122 280.3);

Tailwind

colors: {
  custom: {
    50: '#675891',
    500: '#231b64',
    950: '#000000',
  },
}

SCSS

$custom: #231b64;
$custom-light: #675891;
$custom-dark: #000000;

JSON

{
  "hex": "#231b64",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 100
  },
  "hsl": {
    "h": 246.575,
    "s": 57.48,
    "l": 24.902
  },
  "oklch": {
    "l": 0.28587,
    "c": 0.12237,
    "h": 280.3
  },
  "luminance": 0.02061
}

Semantic roles & 50–950 ramp

primary

#231B64

secondary

#909941

accent

#E147D0

background

#F6F5F9

surface

#EBE9F1

border

#C6C5CB

text

#06030D

muted

#7A787E

Preview Lab

Preview with #231B64

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

Preview Lab → · Contrast checker → · Palette generator →