#181B39#181B39

#181B39 is a very dark, muted blue. Relative luminance 0.013; OKLCH L 23.7% C 0.057 H 276.8°. Best body text is #FFFFFF at 16.74:1 contrast (WCAG AA passes).

Color values

HEX	#181B39
RGB	rgb(24, 27, 57)
HSL	hsl(235, 41%, 16%)
HSV	hsv(235, 58%, 22%)
CMYK	cmyk(57.9%, 52.6%, 0%, 77.6%)
CIE-LAB	lab(11.09, 8.85, -19.98)
CIE-LCH	lch(11.09, 21.86, 293.88°)
OKLab	oklab(23.69% 0.0068 -0.0567)
OKLCH	oklch(23.69% 0.057 276.8)
XYZ	xyz(1.5069, 1.2734, 4.0365)
Luminance	0.0127 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B39 #393618

analogous

#182B39 #181B39 #251839

triadic

#181B39 #39181B #1B3918

tetradic

#181B39 #39182B #393618 #183925

square

#181B39 #39182B #393618 #183925

split-complementary

#181B39 #392518 #2B3918

monochromatic

#090A16 #090A16 #181B39 #2A2F64 #3C448F

Accessibility & contrast

On white

16.74

#181B39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.25

#181B39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B39

16.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B39	#FFFFFF	#000000	##FFFFFF
##181B39	1.00	16.74	1.25	16.74
#FFFFFF	16.74	1.00	21.00	1.00
#000000	1.25	21.00	1.00	21.00
##FFFFFF	16.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E1F3A

Deuteranopia (green-blind)

#0B1C38

Tritanopia (blue-blind)

#0B2127

Achromatopsia (no color)

#1E1E1E

Design tokens & code

CSS

--color: #181b39;
/* rgb */ color: rgb(24, 27, 57);
/* oklch */ color: oklch(23.7% 0.057 276.8);

Tailwind

colors: {
  custom: {
    50: '#58576f',
    500: '#181b39',
    950: '#000000',
  },
}

SCSS

$custom: #181b39;
$custom-light: #58576f;
$custom-dark: #000000;

JSON

{
  "hex": "#181b39",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 57
  },
  "hsl": {
    "h": 234.545,
    "s": 40.741,
    "l": 15.882
  },
  "oklch": {
    "l": 0.2369,
    "c": 0.05715,
    "h": 276.8
  },
  "luminance": 0.01273
}

Semantic roles & 50–950 ramp

primary

#181B39

secondary

#6F6B3E

accent

#C657D1

background

#F5F5F6

surface

#E9E9EC

border

#C5C5C7

text

#030307

muted

#78787A

Preview Lab

Preview with #181B39

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

Preview Lab → · Contrast checker → · Palette generator →