#183B5B#183B5B

#183B5B is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.3% C 0.069 H 248.7°. Best body text is #FFFFFF at 11.57:1 contrast (WCAG AA passes).

Color values

HEX	#183B5B
RGB	rgb(24, 59, 91)
HSL	hsl(209, 58%, 23%)
HSV	hsv(209, 74%, 36%)
CMYK	cmyk(73.6%, 35.2%, 0%, 64.3%)
CIE-LAB	lab(23.92, -0.70, -22.82)
CIE-LCH	lch(23.92, 22.83, 268.26°)
OKLab	oklab(34.34% -0.0252 -0.0646)
OKLCH	oklch(34.34% 0.069 248.7)
XYZ	xyz(3.8283, 4.0770, 10.4807)
Luminance	0.0408 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B5B #5B3818

analogous

#185B5A #183B5B #18195B

triadic

#183B5B #5B183B #3B5B18

tetradic

#183B5B #5A185B #5B3818 #195B18

square

#183B5B #5A185B #5B3818 #195B18

split-complementary

#183B5B #5B1819 #5B5A18

monochromatic

#061018 #0B1C2B #183B5B #255A8B #327ABC

Accessibility & contrast

On white

11.57

#183B5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#183B5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B5B

11.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B5B	#FFFFFF	#000000	##FFFFFF
##183B5B	1.00	11.57	1.82	11.57
#FFFFFF	11.57	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3C5C

Deuteranopia (green-blind)

#23365A

Tritanopia (blue-blind)

#004346

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b5b;
/* rgb */ color: rgb(24, 59, 91);
/* oklch */ color: oklch(34.3% 0.069 248.7);

Tailwind

colors: {
  custom: {
    50: '#5e7089',
    500: '#183b5b',
    950: '#000000',
  },
}

SCSS

$custom: #183b5b;
$custom-light: #5e7089;
$custom-dark: #000000;

JSON

{
  "hex": "#183b5b",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 91
  },
  "hsl": {
    "h": 208.657,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.34339,
    "c": 0.06938,
    "h": 248.7
  },
  "luminance": 0.04077
}

Semantic roles & 50–950 ramp

primary

#183B5B

secondary

#92663D

accent

#9046E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B5B

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

Preview Lab → · Contrast checker → · Palette generator →