#183B51#183B51

#183B51 is a dark, muted cyan. Relative luminance 0.039; OKLCH L 33.7% C 0.056 H 239.1°. Best body text is #FFFFFF at 11.78:1 contrast (WCAG AA passes).

Color values

HEX	#183B51
RGB	rgb(24, 59, 81)
HSL	hsl(203, 54%, 21%)
HSV	hsv(203, 70%, 32%)
CMYK	cmyk(70.4%, 27.2%, 0%, 68.2%)
CIE-LAB	lab(23.39, -4.64, -17.08)
CIE-LCH	lch(23.39, 17.70, 254.82°)
OKLab	oklab(33.74% -0.0288 -0.048)
OKLCH	oklch(33.74% 0.056 239.1)
XYZ	xyz(3.4253, 3.9159, 8.3583)
Luminance	0.0392 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B51 #512E18

analogous

#18514A #183B51 #181E51

triadic

#183B51 #51183B #3B5118

tetradic

#183B51 #4A1851 #512E18 #1E5118

square

#183B51 #4A1851 #512E18 #1E5118

split-complementary

#183B51 #51181E #514A18

monochromatic

#071118 #0A1922 #183B51 #265D80 #3480AF

Accessibility & contrast

On white

11.78

#183B51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#183B51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B51

11.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B51	#FFFFFF	#000000	##FFFFFF
##183B51	1.00	11.78	1.78	11.78
#FFFFFF	11.78	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313B52

Deuteranopia (green-blind)

#293551

Tritanopia (blue-blind)

#004142

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183b51;
/* rgb */ color: rgb(24, 59, 81);
/* oklch */ color: oklch(33.7% 0.056 239.1);

Tailwind

colors: {
  custom: {
    50: '#5c7082',
    500: '#183b51',
    950: '#000000',
  },
}

SCSS

$custom: #183b51;
$custom-light: #5c7082;
$custom-dark: #000000;

JSON

{
  "hex": "#183b51",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 81
  },
  "hsl": {
    "h": 203.158,
    "s": 54.286,
    "l": 20.588
  },
  "oklch": {
    "l": 0.33743,
    "c": 0.05597,
    "h": 239.1
  },
  "luminance": 0.03916
}

Semantic roles & 50–950 ramp

primary

#183B51

secondary

#885A3D

accent

#834ADE

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#04070A

muted

#797A7C

Preview Lab

Preview with #183B51

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

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