#183F4B#183F4B

#183F4B is a dark, muted cyan. Relative luminance 0.043; OKLCH L 34.5% C 0.048 H 221.1°. Best body text is #FFFFFF at 11.34:1 contrast (WCAG AA passes).

Color values

HEX	#183F4B
RGB	rgb(24, 63, 75)
HSL	hsl(194, 52%, 19%)
HSV	hsv(194, 68%, 29%)
CMYK	cmyk(68%, 16%, 0%, 70.6%)
CIE-LAB	lab(24.50, -9.45, -11.40)
CIE-LCH	lch(24.50, 14.81, 230.34°)
OKLab	oklab(34.54% -0.0364 -0.0317)
OKLCH	oklch(34.54% 0.048 221.1)
XYZ	xyz(3.4237, 4.2569, 7.2965)
Luminance	0.0426 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F4B #4B2418

analogous

#184B3E #183F4B #18264B

triadic

#183F4B #4B183F #3F4B18

tetradic

#183F4B #3E184B #4B2418 #264B18

square

#183F4B #3E184B #4B2418 #264B18

split-complementary

#183F4B #4B1826 #4B3E18

monochromatic

#071317 #09181D #183F4B #276679 #368DA8

Accessibility & contrast

On white

11.34

#183F4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183F4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F4B

11.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F4B	#FFFFFF	#000000	##FFFFFF
##183F4B	1.00	11.34	1.85	11.34
#FFFFFF	11.34	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#383D4C

Deuteranopia (green-blind)

#30384B

Tritanopia (blue-blind)

#004343

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183f4b;
/* rgb */ color: rgb(24, 63, 75);
/* oklch */ color: oklch(34.5% 0.048 221.1);

Tailwind

colors: {
  custom: {
    50: '#5b747d',
    500: '#183f4b',
    950: '#000000',
  },
}

SCSS

$custom: #183f4b;
$custom-light: #5b747d;
$custom-dark: #000000;

JSON

{
  "hex": "#183f4b",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 75
  },
  "hsl": {
    "h": 194.118,
    "s": 51.515,
    "l": 19.412
  },
  "oklch": {
    "l": 0.34536,
    "c": 0.04826,
    "h": 221.1
  },
  "luminance": 0.04257
}

Semantic roles & 50–950 ramp

primary

#183F4B

secondary

#824D3D

accent

#6E4DDB

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#040809

muted

#797B7B

Preview Lab

Preview with #183F4B

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

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