#183A59#183A59

#183A59 is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 34.0% C 0.068 H 248.6°. Best body text is #FFFFFF at 11.74:1 contrast (WCAG AA passes).

Color values

HEX	#183A59
RGB	rgb(24, 58, 89)
HSL	hsl(209, 58%, 22%)
HSV	hsv(209, 73%, 35%)
CMYK	cmyk(73%, 34.8%, 0%, 65.1%)
CIE-LAB	lab(23.48, -0.82, -22.22)
CIE-LCH	lch(23.48, 22.23, 267.89°)
OKLab	oklab(33.95% -0.0247 -0.0629)
OKLCH	oklch(33.95% 0.068 248.6)
XYZ	xyz(3.6922, 3.9412, 10.0154)
Luminance	0.0394 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A59 #593718

analogous

#185958 #183A59 #181A59

triadic

#183A59 #59183A #3A5918

tetradic

#183A59 #581859 #593718 #1A5918

square

#183A59 #581859 #593718 #1A5918

split-complementary

#183A59 #59181A #595818

monochromatic

#061018 #0B1B29 #183A59 #255989 #3279B9

Accessibility & contrast

On white

11.74

#183A59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#183A59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A59

11.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A59	#FFFFFF	#000000	##FFFFFF
##183A59	1.00	11.74	1.79	11.74
#FFFFFF	11.74	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3B5A

Deuteranopia (green-blind)

#233558

Tritanopia (blue-blind)

#004145

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183a59;
/* rgb */ color: rgb(24, 58, 89);
/* oklch */ color: oklch(34.0% 0.068 248.6);

Tailwind

colors: {
  custom: {
    50: '#5d6f88',
    500: '#183a59',
    950: '#000000',
  },
}

SCSS

$custom: #183a59;
$custom-light: #5d6f88;
$custom-dark: #000000;

JSON

{
  "hex": "#183a59",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 89
  },
  "hsl": {
    "h": 208.615,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.3395,
    "c": 0.06758,
    "h": 248.6
  },
  "luminance": 0.03942
}

Semantic roles & 50–950 ramp

primary

#183A59

secondary

#90643D

accent

#9047E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183A59

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

Preview Lab → · Contrast checker → · Palette generator →