#183B5C#183B5C

#183B5C is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.4% C 0.071 H 249.5°. Best body text is #FFFFFF at 11.54:1 contrast (WCAG AA passes).

Color values

HEX	#183B5C
RGB	rgb(24, 59, 92)
HSL	hsl(209, 59%, 23%)
HSV	hsv(209, 74%, 36%)
CMYK	cmyk(73.9%, 35.9%, 0%, 63.9%)
CIE-LAB	lab(23.98, -0.29, -23.39)
CIE-LCH	lch(23.98, 23.39, 269.28°)
OKLab	oklab(34.4% -0.0248 -0.0663)
OKLCH	oklch(34.4% 0.071 249.5)
XYZ	xyz(3.8717, 4.0944, 10.7094)
Luminance	0.0410 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B5C #5C3918

analogous

#185C5B #183B5C #18195C

triadic

#183B5C #5C183B #3B5C18

tetradic

#183B5C #5B185C #5C3918 #195C18

square

#183B5C #5B185C #5C3918 #195C18

split-complementary

#183B5C #5C1819 #5C5B18

monochromatic

#061018 #0B1C2B #183B5C #255A8D #3179BD

Accessibility & contrast

On white

11.54

#183B5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#183B5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B5C

11.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B5C	#FFFFFF	#000000	##FFFFFF
##183B5C	1.00	11.54	1.82	11.54
#FFFFFF	11.54	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3D5D

Deuteranopia (green-blind)

#23365B

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b5c;
/* rgb */ color: rgb(24, 59, 92);
/* oklch */ color: oklch(34.4% 0.071 249.5);

Tailwind

colors: {
  custom: {
    50: '#5e708a',
    500: '#183b5c',
    950: '#000000',
  },
}

SCSS

$custom: #183b5c;
$custom-light: #5e708a;
$custom-dark: #000000;

JSON

{
  "hex": "#183b5c",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 92
  },
  "hsl": {
    "h": 209.118,
    "s": 58.621,
    "l": 22.745
  },
  "oklch": {
    "l": 0.34403,
    "c": 0.0708,
    "h": 249.5
  },
  "luminance": 0.04095
}

Semantic roles & 50–950 ramp

primary

#183B5C

secondary

#93673D

accent

#9246E2

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B5C

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

Preview Lab → · Contrast checker → · Palette generator →