#183D5E#183D5E

#183D5E is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 35.1% C 0.072 H 248.3°. Best body text is #FFFFFF at 11.24:1 contrast (WCAG AA passes).

Color values

HEX	#183D5E
RGB	rgb(24, 61, 94)
HSL	hsl(208, 59%, 23%)
HSV	hsv(208, 74%, 37%)
CMYK	cmyk(74.5%, 35.1%, 0%, 63.1%)
CIE-LAB	lab(24.76, -0.85, -23.46)
CIE-LCH	lch(24.76, 23.47, 267.93°)
OKLab	oklab(35.05% -0.0265 -0.0665)
OKLCH	oklch(35.05% 0.072 248.3)
XYZ	xyz(4.0651, 4.3394, 11.2109)
Luminance	0.0434 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5E #5E3918

analogous

#185E5C #183D5E #181A5E

triadic

#183D5E #5E183D #3D5E18

tetradic

#183D5E #5C185E #5E3918 #1A5E18

square

#183D5E #5C185E #5E3918 #1A5E18

split-complementary

#183D5E #5E181A #5E5C18

monochromatic

#061018 #0C1D2D #183D5E #245D8F #317CC0

Accessibility & contrast

On white

11.24

#183D5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#183D5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5E

11.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5E	#FFFFFF	#000000	##FFFFFF
##183D5E	1.00	11.24	1.87	11.24
#FFFFFF	11.24	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3E5F

Deuteranopia (green-blind)

#24385D

Tritanopia (blue-blind)

#004549

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183d5e;
/* rgb */ color: rgb(24, 61, 94);
/* oklch */ color: oklch(35.1% 0.072 248.3);

Tailwind

colors: {
  custom: {
    50: '#5f728c',
    500: '#183d5e',
    950: '#000000',
  },
}

SCSS

$custom: #183d5e;
$custom-light: #5f728c;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5e",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 94
  },
  "hsl": {
    "h": 208.286,
    "s": 59.322,
    "l": 23.137
  },
  "oklch": {
    "l": 0.35054,
    "c": 0.07156,
    "h": 248.3
  },
  "luminance": 0.0434
}

Semantic roles & 50–950 ramp

primary

#183D5E

secondary

#94663D

accent

#8F45E3

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183D5E

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

Preview Lab → · Contrast checker → · Palette generator →