#181B3D#181B3D

#181B3D is a very dark, moderate blue. Relative luminance 0.013; OKLCH L 24.0% C 0.064 H 276.6°. Best body text is #FFFFFF at 16.63:1 contrast (WCAG AA passes).

Color values

HEX	#181B3D
RGB	rgb(24, 27, 61)
HSL	hsl(235, 44%, 17%)
HSV	hsv(235, 61%, 24%)
CMYK	cmyk(60.7%, 55.7%, 0%, 76.1%)
CIE-LAB	lab(11.38, 10.41, -22.36)
CIE-LCH	lch(11.38, 24.67, 294.97°)
OKLab	oklab(24% 0.0074 -0.0637)
OKLCH	oklch(24% 0.064 276.6)
XYZ	xyz(1.6107, 1.3149, 4.5829)
Luminance	0.0132 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B3D #3D3A18

analogous

#182E3D #181B3D #28183D

triadic

#181B3D #3D181B #1B3D18

tetradic

#181B3D #3D182E #3D3A18 #183D28

square

#181B3D #3D182E #3D3A18 #183D28

split-complementary

#181B3D #3D2818 #2E3D18

monochromatic

#090A16 #090A16 #181B3D #292E69 #3B4295

Accessibility & contrast

On white

16.63

#181B3D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.26

#181B3D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B3D

16.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B3D	#FFFFFF	#000000	##FFFFFF
##181B3D	1.00	16.63	1.26	16.63
#FFFFFF	16.63	1.00	21.00	1.00
#000000	1.26	21.00	1.00	21.00
##FFFFFF	16.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0B203E

Deuteranopia (green-blind)

#071D3C

Tritanopia (blue-blind)

#082229

Achromatopsia (no color)

#1E1E1E

Design tokens & code

CSS

--color: #181b3d;
/* rgb */ color: rgb(24, 27, 61);
/* oklch */ color: oklch(24.0% 0.064 276.6);

Tailwind

colors: {
  custom: {
    50: '#585773',
    500: '#181b3d',
    950: '#000000',
  },
}

SCSS

$custom: #181b3d;
$custom-light: #585773;
$custom-dark: #000000;

JSON

{
  "hex": "#181b3d",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 61
  },
  "hsl": {
    "h": 235.135,
    "s": 43.529,
    "l": 16.667
  },
  "oklch": {
    "l": 0.24004,
    "c": 0.06417,
    "h": 276.6
  },
  "luminance": 0.01315
}

Semantic roles & 50–950 ramp

primary

#181B3D

secondary

#736F3D

accent

#C955D3

background

#F5F5F6

surface

#E9E9EC

border

#C5C5C7

text

#030308

muted

#78787B

Preview Lab

Preview with #181B3D

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

Preview Lab → · Contrast checker → · Palette generator →