#183A57#183A57

#183A57 is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 33.8% C 0.065 H 246.9°. Best body text is #FFFFFF at 11.79:1 contrast (WCAG AA passes).

Color values

HEX	#183A57
RGB	rgb(24, 58, 87)
HSL	hsl(208, 57%, 22%)
HSV	hsv(208, 72%, 34%)
CMYK	cmyk(72.4%, 33.3%, 0%, 65.9%)
CIE-LAB	lab(23.36, -1.61, -21.08)
CIE-LCH	lch(23.36, 21.14, 265.62°)
OKLab	oklab(33.83% -0.0254 -0.0596)
OKLCH	oklch(33.83% 0.065 246.9)
XYZ	xyz(3.6094, 3.9080, 9.5791)
Luminance	0.0391 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A57 #573518

analogous

#185755 #183A57 #181B57

triadic

#183A57 #57183A #3A5718

tetradic

#183A57 #551857 #573518 #1B5718

square

#183A57 #551857 #573518 #1B5718

split-complementary

#183A57 #57181B #575518

monochromatic

#071018 #0B1A27 #183A57 #255A87 #327AB7

Accessibility & contrast

On white

11.79

#183A57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#183A57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A57

11.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A57	#FFFFFF	#000000	##FFFFFF
##183A57	1.00	11.79	1.78	11.79
#FFFFFF	11.79	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3B58

Deuteranopia (green-blind)

#243556

Tritanopia (blue-blind)

#004144

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183a57;
/* rgb */ color: rgb(24, 58, 87);
/* oklch */ color: oklch(33.8% 0.065 246.9);

Tailwind

colors: {
  custom: {
    50: '#5d6f86',
    500: '#183a57',
    950: '#000000',
  },
}

SCSS

$custom: #183a57;
$custom-light: #5d6f86;
$custom-dark: #000000;

JSON

{
  "hex": "#183a57",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 87
  },
  "hsl": {
    "h": 207.619,
    "s": 56.757,
    "l": 21.765
  },
  "oklch": {
    "l": 0.33826,
    "c": 0.06476,
    "h": 246.9
  },
  "luminance": 0.03908
}

Semantic roles & 50–950 ramp

primary

#183A57

secondary

#8E623D

accent

#8E48E0

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183A57

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

Preview Lab → · Contrast checker → · Palette generator →