#183B59#183B59

#183B59 is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.067 H 247.2°. Best body text is #FFFFFF at 11.61:1 contrast (WCAG AA passes).

Color values

HEX	#183B59
RGB	rgb(24, 59, 89)
HSL	hsl(208, 58%, 22%)
HSV	hsv(208, 73%, 35%)
CMYK	cmyk(73%, 33.7%, 0%, 65.1%)
CIE-LAB	lab(23.81, -1.50, -21.69)
CIE-LCH	lch(23.81, 21.74, 266.05°)
OKLab	oklab(34.22% -0.0258 -0.0613)
OKLCH	oklch(34.22% 0.067 247.2)
XYZ	xyz(3.7431, 4.0430, 10.0324)
Luminance	0.0404 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B59 #593618

analogous

#185957 #183B59 #181B59

triadic

#183B59 #59183B #3B5918

tetradic

#183B59 #571859 #593618 #1B5918

square

#183B59 #571859 #593618 #1B5918

split-complementary

#183B59 #59181B #595718

monochromatic

#061018 #0B1B29 #183B59 #255B89 #327BB9

Accessibility & contrast

On white

11.61

#183B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#183B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B59

11.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B59	#FFFFFF	#000000	##FFFFFF
##183B59	1.00	11.61	1.81	11.61
#FFFFFF	11.61	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3C5A

Deuteranopia (green-blind)

#253658

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b59;
/* rgb */ color: rgb(24, 59, 89);
/* oklch */ color: oklch(34.2% 0.067 247.2);

Tailwind

colors: {
  custom: {
    50: '#5d7088',
    500: '#183b59',
    950: '#000000',
  },
}

SCSS

$custom: #183b59;
$custom-light: #5d7088;
$custom-dark: #000000;

JSON

{
  "hex": "#183b59",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 89
  },
  "hsl": {
    "h": 207.692,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.34215,
    "c": 0.06657,
    "h": 247.2
  },
  "luminance": 0.04043
}

Semantic roles & 50–950 ramp

primary

#183B59

secondary

#90633D

accent

#8E47E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B59

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

Preview Lab → · Contrast checker → · Palette generator →