#183F55#183F55

#183F55 is a dark, muted cyan. Relative luminance 0.044; OKLCH L 35.1% C 0.058 H 236.5°. Best body text is #FFFFFF at 11.16:1 contrast (WCAG AA passes).

Color values

HEX	#183F55
RGB	rgb(24, 63, 85)
HSL	hsl(202, 56%, 21%)
HSV	hsv(202, 72%, 33%)
CMYK	cmyk(71.8%, 25.9%, 0%, 66.7%)
CIE-LAB	lab(24.97, -5.71, -17.27)
CIE-LCH	lch(24.97, 18.19, 251.70°)
OKLab	oklab(35.06% -0.0321 -0.0485)
OKLCH	oklch(35.06% 0.058 236.5)
XYZ	xyz(3.7933, 4.4047, 9.2428)
Luminance	0.0440 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F55 #552E18

analogous

#18554D #183F55 #182155

triadic

#183F55 #55183F #3F5518

tetradic

#183F55 #4D1855 #552E18 #215518

square

#183F55 #4D1855 #552E18 #215518

split-complementary

#183F55 #551821 #554D18

monochromatic

#071218 #0B1C25 #183F55 #256285 #3386B4

Accessibility & contrast

On white

11.16

#183F55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#183F55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F55

11.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F55	#FFFFFF	#000000	##FFFFFF
##183F55	1.00	11.16	1.88	11.16
#FFFFFF	11.16	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#353F56

Deuteranopia (green-blind)

#2C3955

Tritanopia (blue-blind)

#004546

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183f55;
/* rgb */ color: rgb(24, 63, 85);
/* oklch */ color: oklch(35.1% 0.058 236.5);

Tailwind

colors: {
  custom: {
    50: '#5d7485',
    500: '#183f55',
    950: '#000000',
  },
}

SCSS

$custom: #183f55;
$custom-light: #5d7485;
$custom-dark: #000000;

JSON

{
  "hex": "#183f55",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 85
  },
  "hsl": {
    "h": 201.639,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.35059,
    "c": 0.05814,
    "h": 236.5
  },
  "luminance": 0.04405
}

Semantic roles & 50–950 ramp

primary

#183F55

secondary

#8C593D

accent

#7F49DF

background

#F5F7F8

surface

#E9EDEF

border

#C5C8CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F55

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

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