#183B4B#183B4B

#183B4B is a dark, muted cyan. Relative luminance 0.038; OKLCH L 33.4% C 0.049 H 230.5°. Best body text is #FFFFFF at 11.89:1 contrast (WCAG AA passes).

Color values

HEX	#183B4B
RGB	rgb(24, 59, 75)
HSL	hsl(199, 52%, 19%)
HSV	hsv(199, 68%, 29%)
CMYK	cmyk(68%, 21.3%, 0%, 70.6%)
CIE-LAB	lab(23.10, -6.91, -13.56)
CIE-LCH	lch(23.10, 15.22, 242.97°)
OKLab	oklab(33.42% -0.0313 -0.0379)
OKLCH	oklch(33.42% 0.049 230.5)
XYZ	xyz(3.2102, 3.8298, 7.2253)
Luminance	0.0383 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B4B #4B2818

analogous

#184B42 #183B4B #18224B

triadic

#183B4B #4B183B #3B4B18

tetradic

#183B4B #42184B #4B2818 #224B18

square

#183B4B #42184B #4B2818 #224B18

split-complementary

#183B4B #4B1822 #4B4218

monochromatic

#071217 #09171D #183B4B #275F79 #3684A8

Accessibility & contrast

On white

11.89

#183B4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#183B4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B4B

11.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B4B	#FFFFFF	#000000	##FFFFFF
##183B4B	1.00	11.89	1.77	11.89
#FFFFFF	11.89	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333A4C

Deuteranopia (green-blind)

#2C354B

Tritanopia (blue-blind)

#003F40

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #183b4b;
/* rgb */ color: rgb(24, 59, 75);
/* oklch */ color: oklch(33.4% 0.049 230.5);

Tailwind

colors: {
  custom: {
    50: '#5b707d',
    500: '#183b4b',
    950: '#000000',
  },
}

SCSS

$custom: #183b4b;
$custom-light: #5b707d;
$custom-dark: #000000;

JSON

{
  "hex": "#183b4b",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 75
  },
  "hsl": {
    "h": 198.824,
    "s": 51.515,
    "l": 19.412
  },
  "oklch": {
    "l": 0.33416,
    "c": 0.04911,
    "h": 230.5
  },
  "luminance": 0.0383
}

Semantic roles & 50–950 ramp

primary

#183B4B

secondary

#82533D

accent

#794DDB

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#040709

muted

#797A7B

Preview Lab

Preview with #183B4B

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

Preview Lab → · Contrast checker → · Palette generator →