#183F59#183F59

#183F59 is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.3% C 0.063 H 241.0°. Best body text is #FFFFFF at 11.09:1 contrast (WCAG AA passes).

Color values

HEX	#183F59
RGB	rgb(24, 63, 89)
HSL	hsl(204, 58%, 22%)
HSV	hsv(204, 73%, 35%)
CMYK	cmyk(73%, 29.2%, 0%, 65.1%)
CIE-LAB	lab(25.17, -4.16, -19.57)
CIE-LCH	lch(25.17, 20.00, 257.99°)
OKLab	oklab(35.28% -0.0305 -0.0551)
OKLCH	oklch(35.28% 0.063 241)
XYZ	xyz(3.9567, 4.4701, 10.1035)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F59 #593218

analogous

#185953 #183F59 #181F59

triadic

#183F59 #59183F #3F5918

tetradic

#183F59 #531859 #593218 #1F5918

square

#183F59 #531859 #593218 #1F5918

split-complementary

#183F59 #59181F #595318

monochromatic

#061118 #0B1D29 #183F59 #256189 #3283B9

Accessibility & contrast

On white

11.09

#183F59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#183F59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F59

11.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F59	#FFFFFF	#000000	##FFFFFF
##183F59	1.00	11.09	1.89	11.09
#FFFFFF	11.09	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333F5A

Deuteranopia (green-blind)

#2A3959

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f59;
/* rgb */ color: rgb(24, 63, 89);
/* oklch */ color: oklch(35.3% 0.063 241.0);

Tailwind

colors: {
  custom: {
    50: '#5e7388',
    500: '#183f59',
    950: '#000000',
  },
}

SCSS

$custom: #183f59;
$custom-light: #5e7388;
$custom-dark: #000000;

JSON

{
  "hex": "#183f59",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 89
  },
  "hsl": {
    "h": 204,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.35285,
    "c": 0.06303,
    "h": 241
  },
  "luminance": 0.0447
}

Semantic roles & 50–950 ramp

primary

#183F59

secondary

#905E3D

accent

#8547E1

background

#F5F7F8

surface

#E9EDEF

border

#C5C8CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F59

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

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