#183D57#183D57

#183D57 is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.6% C 0.062 H 242.2°. Best body text is #FFFFFF at 11.39:1 contrast (WCAG AA passes).

Color values

HEX	#183D57
RGB	rgb(24, 61, 87)
HSL	hsl(205, 57%, 22%)
HSV	hsv(205, 72%, 34%)
CMYK	cmyk(72.4%, 29.9%, 0%, 65.9%)
CIE-LAB	lab(24.38, -3.62, -19.48)
CIE-LCH	lch(24.38, 19.82, 259.46°)
OKLab	oklab(34.63% -0.0289 -0.0549)
OKLCH	oklch(34.63% 0.062 242.2)
XYZ	xyz(3.7651, 4.2194, 9.6310)
Luminance	0.0422 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D57 #573218

analogous

#185752 #183D57 #181E57

triadic

#183D57 #57183D #3D5718

tetradic

#183D57 #521857 #573218 #1E5718

square

#183D57 #521857 #573218 #1E5718

split-complementary

#183D57 #57181E #575218

monochromatic

#071118 #0B1B27 #183D57 #255F87 #3280B7

Accessibility & contrast

On white

11.39

#183D57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#183D57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D57

11.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D57	#FFFFFF	#000000	##FFFFFF
##183D57	1.00	11.39	1.84	11.39
#FFFFFF	11.39	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313D58

Deuteranopia (green-blind)

#293757

Tritanopia (blue-blind)

#004346

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d57;
/* rgb */ color: rgb(24, 61, 87);
/* oklch */ color: oklch(34.6% 0.062 242.2);

Tailwind

colors: {
  custom: {
    50: '#5d7286',
    500: '#183d57',
    950: '#000000',
  },
}

SCSS

$custom: #183d57;
$custom-light: #5d7286;
$custom-dark: #000000;

JSON

{
  "hex": "#183d57",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 87
  },
  "hsl": {
    "h": 204.762,
    "s": 56.757,
    "l": 21.765
  },
  "oklch": {
    "l": 0.34631,
    "c": 0.06206,
    "h": 242.2
  },
  "luminance": 0.0422
}

Semantic roles & 50–950 ramp

primary

#183D57

secondary

#8E5E3D

accent

#8748E0

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183D57

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

Preview Lab → · Contrast checker → · Palette generator →