#183B4D#183B4D

#183B4D is a dark, muted cyan. Relative luminance 0.039; OKLCH L 33.5% C 0.051 H 233.6°. Best body text is #FFFFFF at 11.85:1 contrast (WCAG AA passes).

Color values

HEX	#183B4D
RGB	rgb(24, 59, 77)
HSL	hsl(200, 52%, 20%)
HSV	hsv(200, 69%, 30%)
CMYK	cmyk(68.8%, 23.4%, 0%, 69.8%)
CIE-LAB	lab(23.20, -6.16, -14.74)
CIE-LCH	lch(23.20, 15.98, 247.31°)
OKLab	oklab(33.52% -0.0304 -0.0412)
OKLCH	oklch(33.52% 0.051 233.6)
XYZ	xyz(3.2797, 3.8576, 7.5915)
Luminance	0.0386 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B4D #4D2A18

analogous

#184D44 #183B4D #18214D

triadic

#183B4D #4D183B #3B4D18

tetradic

#183B4D #44184D #4D2A18 #214D18

square

#183B4D #44184D #4D2A18 #214D18

split-complementary

#183B4D #4D1821 #4D4418

monochromatic

#071217 #09171E #183B4D #275F7C #3583AA

Accessibility & contrast

On white

11.85

#183B4D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#183B4D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B4D

11.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B4D	#FFFFFF	#000000	##FFFFFF
##183B4D	1.00	11.85	1.77	11.85
#FFFFFF	11.85	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323A4E

Deuteranopia (green-blind)

#2B354D

Tritanopia (blue-blind)

#004041

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #183b4d;
/* rgb */ color: rgb(24, 59, 77);
/* oklch */ color: oklch(33.5% 0.051 233.6);

Tailwind

colors: {
  custom: {
    50: '#5b707e',
    500: '#183b4d',
    950: '#000000',
  },
}

SCSS

$custom: #183b4d;
$custom-light: #5b707e;
$custom-dark: #000000;

JSON

{
  "hex": "#183b4d",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 77
  },
  "hsl": {
    "h": 200.377,
    "s": 52.475,
    "l": 19.804
  },
  "oklch": {
    "l": 0.33523,
    "c": 0.05125,
    "h": 233.6
  },
  "luminance": 0.03858
}

Semantic roles & 50–950 ramp

primary

#183B4D

secondary

#84553D

accent

#7D4CDC

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#04070A

muted

#797A7C

Preview Lab

Preview with #183B4D

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

Preview Lab → · Contrast checker → · Palette generator →