#183D4A#183D4A

#183D4A is a dark, muted cyan. Relative luminance 0.040; OKLCH L 33.9% C 0.048 H 224.0°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#183D4A
RGB	rgb(24, 61, 74)
HSL	hsl(196, 51%, 19%)
HSV	hsv(196, 68%, 29%)
CMYK	cmyk(67.6%, 17.6%, 0%, 71%)
CIE-LAB	lab(23.76, -8.56, -11.88)
CIE-LCH	lch(23.76, 14.65, 234.23°)
OKLab	oklab(33.92% -0.0343 -0.0331)
OKLCH	oklch(33.92% 0.048 224)
XYZ	xyz(3.2810, 4.0258, 7.0814)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D4A #4A2518

analogous

#184A3E #183D4A #18244A

triadic

#183D4A #4A183D #3D4A18

tetradic

#183D4A #3E184A #4A2518 #244A18

square

#183D4A #3E184A #4A2518 #244A18

split-complementary

#183D4A #4A1824 #4A3E18

monochromatic

#071317 #09171C #183D4A #276378 #3689A6

Accessibility & contrast

On white

11.63

#183D4A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#183D4A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D4A

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D4A	#FFFFFF	#000000	##FFFFFF
##183D4A	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#363C4B

Deuteranopia (green-blind)

#2F364A

Tritanopia (blue-blind)

#004141

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183d4a;
/* rgb */ color: rgb(24, 61, 74);
/* oklch */ color: oklch(33.9% 0.048 224.0);

Tailwind

colors: {
  custom: {
    50: '#5b727c',
    500: '#183d4a',
    950: '#000000',
  },
}

SCSS

$custom: #183d4a;
$custom-light: #5b727c;
$custom-dark: #000000;

JSON

{
  "hex": "#183d4a",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 74
  },
  "hsl": {
    "h": 195.6,
    "s": 51.02,
    "l": 19.216
  },
  "oklch": {
    "l": 0.33924,
    "c": 0.04764,
    "h": 224
  },
  "luminance": 0.04026
}

Semantic roles & 50–950 ramp

primary

#183D4A

secondary

#814F3D

accent

#724DDA

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#040809

muted

#797B7B

Preview Lab

Preview with #183D4A

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

Preview Lab → · Contrast checker → · Palette generator →