#183C5A#183C5A

#183C5A is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.5% C 0.067 H 246.5°. Best body text is #FFFFFF at 11.46:1 contrast (WCAG AA passes).

Color values

HEX	#183C5A
RGB	rgb(24, 60, 90)
HSL	hsl(207, 58%, 22%)
HSV	hsv(207, 73%, 35%)
CMYK	cmyk(73.3%, 33.3%, 0%, 64.7%)
CIE-LAB	lab(24.21, -1.77, -21.73)
CIE-LCH	lch(24.21, 21.80, 265.34°)
OKLab	oklab(34.54% -0.0267 -0.0614)
OKLCH	oklch(34.54% 0.067 246.5)
XYZ	xyz(3.8373, 4.1637, 10.2723)
Luminance	0.0416 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C5A #5A3618

analogous

#185A57 #183C5A #181B5A

triadic

#183C5A #5A183C #3C5A18

tetradic

#183C5A #57185A #5A3618 #1B5A18

square

#183C5A #57185A #5A3618 #1B5A18

split-complementary

#183C5A #5A181B #5A5718

monochromatic

#061018 #0B1C2A #183C5A #255C8A #327CBB

Accessibility & contrast

On white

11.46

#183C5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#183C5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C5A

11.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C5A	#FFFFFF	#000000	##FFFFFF
##183C5A	1.00	11.46	1.83	11.46
#FFFFFF	11.46	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3D5B

Deuteranopia (green-blind)

#253759

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183c5a;
/* rgb */ color: rgb(24, 60, 90);
/* oklch */ color: oklch(34.5% 0.067 246.5);

Tailwind

colors: {
  custom: {
    50: '#5e7189',
    500: '#183c5a',
    950: '#000000',
  },
}

SCSS

$custom: #183c5a;
$custom-light: #5e7189;
$custom-dark: #000000;

JSON

{
  "hex": "#183c5a",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 90
  },
  "hsl": {
    "h": 207.273,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.34542,
    "c": 0.06699,
    "h": 246.5
  },
  "luminance": 0.04164
}

Semantic roles & 50–950 ramp

primary

#183C5A

secondary

#91633D

accent

#8D47E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183C5A

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

Preview Lab → · Contrast checker → · Palette generator →