#231B4D#231B4D

#231B4D is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.4% C 0.088 H 286.0°. Best body text is #FFFFFF at 15.73:1 contrast (WCAG AA passes).

Color values

HEX	#231B4D
RGB	rgb(35, 27, 77)
HSL	hsl(250, 48%, 20%)
HSV	hsv(250, 65%, 30%)
CMYK	cmyk(54.5%, 64.9%, 0%, 69.8%)
CIE-LAB	lab(13.69, 19.20, -29.74)
CIE-LCH	lch(13.69, 35.40, 302.84°)
OKLab	oklab(26.39% 0.0243 -0.0851)
OKLCH	oklch(26.39% 0.088 286)
XYZ	xyz(2.4242, 1.6769, 7.2157)
Luminance	0.0168 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 7.26

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B4D #454D1B

analogous

#1B2C4D #231B4D #3C1B4D

triadic

#231B4D #4D231B #1B4D23

tetradic

#231B4D #4D1B2C #454D1B #1B4D3C

square

#231B4D #4D1B2C #454D1B #1B4D3C

split-complementary

#231B4D #4D3C1B #2C4D1B

monochromatic

#0A0817 #0E0B20 #231B4D #382B7A #4C3BA8

Accessibility & contrast

On white

15.73

#231B4D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#231B4D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B4D

15.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B4D	#FFFFFF	#000000	##FFFFFF
##231B4D	1.00	15.73	1.34	15.73
#FFFFFF	15.73	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00244F

Deuteranopia (green-blind)

#00214C

Tritanopia (blue-blind)

#142731

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #231b4d;
/* rgb */ color: rgb(35, 27, 77);
/* oklch */ color: oklch(26.4% 0.088 286.0);

Tailwind

colors: {
  custom: {
    50: '#62577f',
    500: '#231b4d',
    950: '#000000',
  },
}

SCSS

$custom: #231b4d;
$custom-light: #62577f;
$custom-dark: #000000;

JSON

{
  "hex": "#231b4d",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 77
  },
  "hsl": {
    "h": 249.6,
    "s": 48.077,
    "l": 20.392
  },
  "oklch": {
    "l": 0.26394,
    "c": 0.08848,
    "h": 286
  },
  "luminance": 0.01677
}

Semantic roles & 50–950 ramp

primary

#231B4D

secondary

#788341

accent

#D850C2

background

#F6F5F7

surface

#EBE9EE

border

#C6C5C9

text

#05030A

muted

#7A787C

Preview Lab

Preview with #231B4D

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

Preview Lab → · Contrast checker → · Palette generator →