#183C55#183C55

#183C55 is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.2% C 0.060 H 241.8°. Best body text is #FFFFFF at 11.56:1 contrast (WCAG AA passes).

Color values

HEX	#183C55
RGB	rgb(24, 60, 85)
HSL	hsl(205, 56%, 21%)
HSV	hsv(205, 72%, 33%)
CMYK	cmyk(71.8%, 29.4%, 0%, 66.7%)
CIE-LAB	lab(23.94, -3.74, -18.87)
CIE-LCH	lch(23.94, 19.23, 258.78°)
OKLab	oklab(34.24% -0.0285 -0.0531)
OKLCH	oklch(34.24% 0.06 241.8)
XYZ	xyz(3.6316, 4.0814, 9.1890)
Luminance	0.0408 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C55 #553118

analogous

#185550 #183C55 #181E55

triadic

#183C55 #55183C #3C5518

tetradic

#183C55 #501855 #553118 #1E5518

square

#183C55 #501855 #553118 #1E5518

split-complementary

#183C55 #55181E #555018

monochromatic

#071118 #0B1A25 #183C55 #255E85 #337FB4

Accessibility & contrast

On white

11.56

#183C55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#183C55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C55

11.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C55	#FFFFFF	#000000	##FFFFFF
##183C55	1.00	11.56	1.82	11.56
#FFFFFF	11.56	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313C56

Deuteranopia (green-blind)

#283655

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183c55;
/* rgb */ color: rgb(24, 60, 85);
/* oklch */ color: oklch(34.2% 0.060 241.8);

Tailwind

colors: {
  custom: {
    50: '#5d7185',
    500: '#183c55',
    950: '#000000',
  },
}

SCSS

$custom: #183c55;
$custom-light: #5d7185;
$custom-dark: #000000;

JSON

{
  "hex": "#183c55",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 85
  },
  "hsl": {
    "h": 204.59,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.34244,
    "c": 0.06028,
    "h": 241.8
  },
  "luminance": 0.04082
}

Semantic roles & 50–950 ramp

primary

#183C55

secondary

#8C5D3D

accent

#8649DF

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #183C55

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

Preview Lab → · Contrast checker → · Palette generator →