#183F4A#183F4A

#183F4A is a dark, muted cyan. Relative luminance 0.042; OKLCH L 34.5% C 0.048 H 219.2°. Best body text is #FFFFFF at 11.36:1 contrast (WCAG AA passes).

Color values

HEX	#183F4A
RGB	rgb(24, 63, 74)
HSL	hsl(193, 51%, 19%)
HSV	hsv(193, 68%, 29%)
CMYK	cmyk(67.6%, 14.9%, 0%, 71%)
CIE-LAB	lab(24.46, -9.82, -10.81)
CIE-LCH	lch(24.46, 14.60, 227.75°)
OKLab	oklab(34.49% -0.0368 -0.03)
OKLCH	oklch(34.49% 0.048 219.2)
XYZ	xyz(3.3897, 4.2433, 7.1176)
Luminance	0.0424 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F4A #4A2318

analogous

#184A3C #183F4A #18264A

triadic

#183F4A #4A183F #3F4A18

tetradic

#183F4A #3C184A #4A2318 #264A18

square

#183F4A #3C184A #4A2318 #264A18

split-complementary

#183F4A #4A1826 #4A3C18

monochromatic

#071417 #09181C #183F4A #276678 #368EA6

Accessibility & contrast

On white

11.36

#183F4A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183F4A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F4A

11.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F4A	#FFFFFF	#000000	##FFFFFF
##183F4A	1.00	11.36	1.85	11.36
#FFFFFF	11.36	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#383D4B

Deuteranopia (green-blind)

#31384A

Tritanopia (blue-blind)

#004342

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183f4a;
/* rgb */ color: rgb(24, 63, 74);
/* oklch */ color: oklch(34.5% 0.048 219.2);

Tailwind

colors: {
  custom: {
    50: '#5b747c',
    500: '#183f4a',
    950: '#000000',
  },
}

SCSS

$custom: #183f4a;
$custom-light: #5b747c;
$custom-dark: #000000;

JSON

{
  "hex": "#183f4a",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 74
  },
  "hsl": {
    "h": 193.2,
    "s": 51.02,
    "l": 19.216
  },
  "oklch": {
    "l": 0.34487,
    "c": 0.04753,
    "h": 219.2
  },
  "luminance": 0.04244
}

Semantic roles & 50–950 ramp

primary

#183F4A

secondary

#814C3D

accent

#6C4DDA

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#040809

muted

#797B7B

Preview Lab

Preview with #183F4A

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

Preview Lab → · Contrast checker → · Palette generator →