#183D5D#183D5D

#183D5D is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 35.0% C 0.070 H 247.5°. Best body text is #FFFFFF at 11.26:1 contrast (WCAG AA passes).

Color values

HEX	#183D5D
RGB	rgb(24, 61, 93)
HSL	hsl(208, 59%, 23%)
HSV	hsv(208, 74%, 36%)
CMYK	cmyk(74.2%, 34.4%, 0%, 63.5%)
CIE-LAB	lab(24.71, -1.25, -22.90)
CIE-LCH	lch(24.71, 22.93, 266.88°)
OKLab	oklab(34.99% -0.0268 -0.0648)
OKLCH	oklch(34.99% 0.07 247.5)
XYZ	xyz(4.0205, 4.3216, 10.9761)
Luminance	0.0432 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5D #5D3818

analogous

#185D5A #183D5D #181B5D

triadic

#183D5D #5D183D #3D5D18

tetradic

#183D5D #5A185D #5D3818 #1B5D18

square

#183D5D #5A185D #5D3818 #1B5D18

split-complementary

#183D5D #5D181B #5D5A18

monochromatic

#061018 #0B1D2C #183D5D #255D8E #317DBE

Accessibility & contrast

On white

11.26

#183D5D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#183D5D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5D

11.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5D	#FFFFFF	#000000	##FFFFFF
##183D5D	1.00	11.26	1.86	11.26
#FFFFFF	11.26	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3E5E

Deuteranopia (green-blind)

#25385C

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183d5d;
/* rgb */ color: rgb(24, 61, 93);
/* oklch */ color: oklch(35.0% 0.070 247.5);

Tailwind

colors: {
  custom: {
    50: '#5e728b',
    500: '#183d5d',
    950: '#000000',
  },
}

SCSS

$custom: #183d5d;
$custom-light: #5e728b;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5d",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 93
  },
  "hsl": {
    "h": 207.826,
    "s": 58.974,
    "l": 22.941
  },
  "oklch": {
    "l": 0.34992,
    "c": 0.07016,
    "h": 247.5
  },
  "luminance": 0.04322
}

Semantic roles & 50–950 ramp

primary

#183D5D

secondary

#93653D

accent

#8E46E2

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183D5D

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

Preview Lab → · Contrast checker → · Palette generator →