#183D55#183D55

#183D55 is a dark, muted cyan. Relative luminance 0.042; OKLCH L 34.5% C 0.060 H 240.1°. Best body text is #FFFFFF at 11.43:1 contrast (WCAG AA passes).

Color values

HEX	#183D55
RGB	rgb(24, 61, 85)
HSL	hsl(204, 56%, 21%)
HSV	hsv(204, 72%, 33%)
CMYK	cmyk(71.8%, 28.2%, 0%, 66.7%)
CIE-LAB	lab(24.28, -4.41, -18.33)
CIE-LCH	lch(24.28, 18.85, 256.49°)
OKLab	oklab(34.52% -0.0297 -0.0516)
OKLCH	oklch(34.52% 0.06 240.1)
XYZ	xyz(3.6845, 4.1872, 9.2066)
Luminance	0.0419 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D55 #553018

analogous

#18554F #183D55 #181F55

triadic

#183D55 #55183D #3D5518

tetradic

#183D55 #4F1855 #553018 #1F5518

square

#183D55 #4F1855 #553018 #1F5518

split-complementary

#183D55 #55181F #554F18

monochromatic

#071118 #0B1B25 #183D55 #255F85 #3381B4

Accessibility & contrast

On white

11.43

#183D55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#183D55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D55

11.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D55	#FFFFFF	#000000	##FFFFFF
##183D55	1.00	11.43	1.84	11.43
#FFFFFF	11.43	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323D56

Deuteranopia (green-blind)

#2A3755

Tritanopia (blue-blind)

#004345

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183d55;
/* rgb */ color: rgb(24, 61, 85);
/* oklch */ color: oklch(34.5% 0.060 240.1);

Tailwind

colors: {
  custom: {
    50: '#5d7285',
    500: '#183d55',
    950: '#000000',
  },
}

SCSS

$custom: #183d55;
$custom-light: #5d7285;
$custom-dark: #000000;

JSON

{
  "hex": "#183d55",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 85
  },
  "hsl": {
    "h": 203.607,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.34515,
    "c": 0.05951,
    "h": 240.1
  },
  "luminance": 0.04188
}

Semantic roles & 50–950 ramp

primary

#183D55

secondary

#8C5C3D

accent

#8449DF

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #183D55

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

Preview Lab → · Contrast checker → · Palette generator →