#183C5E#183C5E

#183C5E is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.8% C 0.073 H 249.6°. Best body text is #FFFFFF at 11.37:1 contrast (WCAG AA passes).

Color values

HEX	#183C5E
RGB	rgb(24, 60, 94)
HSL	hsl(209, 59%, 23%)
HSV	hsv(209, 74%, 37%)
CMYK	cmyk(74.5%, 36.2%, 0%, 63.1%)
CIE-LAB	lab(24.43, -0.17, -23.98)
CIE-LCH	lch(24.43, 23.99, 269.60°)
OKLab	oklab(34.79% -0.0253 -0.068)
OKLCH	oklch(34.79% 0.073 249.6)
XYZ	xyz(4.0122, 4.2336, 11.1932)
Luminance	0.0423 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183C5E #5E3A18

analogous

#185E5D #183C5E #18195E

triadic

#183C5E #5E183C #3C5E18

tetradic

#183C5E #5D185E #5E3A18 #195E18

square

#183C5E #5D185E #5E3A18 #195E18

split-complementary

#183C5E #5E1819 #5E5D18

monochromatic

#061018 #0C1D2D #183C5E #245B8F #317AC0

Accessibility & contrast

On white

11.37

#183C5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#183C5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183C5E

11.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183C5E	#FFFFFF	#000000	##FFFFFF
##183C5E	1.00	11.37	1.85	11.37
#FFFFFF	11.37	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3E5F

Deuteranopia (green-blind)

#23375D

Tritanopia (blue-blind)

#004448

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #183c5e;
/* rgb */ color: rgb(24, 60, 94);
/* oklch */ color: oklch(34.8% 0.073 249.6);

Tailwind

colors: {
  custom: {
    50: '#5f718c',
    500: '#183c5e',
    950: '#000000',
  },
}

SCSS

$custom: #183c5e;
$custom-light: #5f718c;
$custom-dark: #000000;

JSON

{
  "hex": "#183c5e",
  "rgb": {
    "r": 24,
    "g": 60,
    "b": 94
  },
  "hsl": {
    "h": 209.143,
    "s": 59.322,
    "l": 23.137
  },
  "oklch": {
    "l": 0.34792,
    "c": 0.0726,
    "h": 249.6
  },
  "luminance": 0.04234
}

Semantic roles & 50–950 ramp

primary

#183C5E

secondary

#94683D

accent

#9245E3

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183C5E

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

Preview Lab → · Contrast checker → · Palette generator →