#183F57#183F57

#183F57 is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.2% C 0.061 H 238.9°. Best body text is #FFFFFF at 11.13:1 contrast (WCAG AA passes).

Color values

HEX	#183F57
RGB	rgb(24, 63, 87)
HSL	hsl(203, 57%, 22%)
HSV	hsv(203, 72%, 34%)
CMYK	cmyk(72.4%, 27.6%, 0%, 65.9%)
CIE-LAB	lab(25.07, -4.94, -18.42)
CIE-LCH	lch(25.07, 19.07, 254.99°)
OKLab	oklab(35.17% -0.0313 -0.0518)
OKLCH	oklch(35.17% 0.061 238.9)
XYZ	xyz(3.8738, 4.4369, 9.6672)
Luminance	0.0444 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F57 #573018

analogous

#185750 #183F57 #182057

triadic

#183F57 #57183F #3F5718

tetradic

#183F57 #501857 #573018 #205718

square

#183F57 #501857 #573018 #205718

split-complementary

#183F57 #571820 #575018

monochromatic

#071118 #0B1C27 #183F57 #256287 #3284B7

Accessibility & contrast

On white

11.13

#183F57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#183F57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F57

11.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F57	#FFFFFF	#000000	##FFFFFF
##183F57	1.00	11.13	1.89	11.13
#FFFFFF	11.13	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#343F58

Deuteranopia (green-blind)

#2B3957

Tritanopia (blue-blind)

#004547

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183f57;
/* rgb */ color: rgb(24, 63, 87);
/* oklch */ color: oklch(35.2% 0.061 238.9);

Tailwind

colors: {
  custom: {
    50: '#5d7386',
    500: '#183f57',
    950: '#000000',
  },
}

SCSS

$custom: #183f57;
$custom-light: #5d7386;
$custom-dark: #000000;

JSON

{
  "hex": "#183f57",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 87
  },
  "hsl": {
    "h": 202.857,
    "s": 56.757,
    "l": 21.765
  },
  "oklch": {
    "l": 0.35171,
    "c": 0.06053,
    "h": 238.9
  },
  "luminance": 0.04437
}

Semantic roles & 50–950 ramp

primary

#183F57

secondary

#8E5C3D

accent

#8248E0

background

#F5F7F8

surface

#E9EDEF

border

#C5C8CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F57

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

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