#183E59#183E59

#183E59 is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.0% C 0.064 H 242.6°. Best body text is #FFFFFF at 11.22:1 contrast (WCAG AA passes).

Color values

HEX	#183E59
RGB	rgb(24, 62, 89)
HSL	hsl(205, 58%, 22%)
HSV	hsv(205, 73%, 35%)
CMYK	cmyk(73%, 30.3%, 0%, 65.1%)
CIE-LAB	lab(24.83, -3.50, -20.10)
CIE-LCH	lch(24.83, 20.40, 260.11°)
OKLab	oklab(35.02% -0.0294 -0.0567)
OKLCH	oklch(35.02% 0.064 242.6)
XYZ	xyz(3.9018, 4.3603, 10.0852)
Luminance	0.0436 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E59 #593318

analogous

#185954 #183E59 #181E59

triadic

#183E59 #59183E #3E5918

tetradic

#183E59 #541859 #593318 #1E5918

square

#183E59 #541859 #593318 #1E5918

split-complementary

#183E59 #59181E #595418

monochromatic

#061118 #0B1C29 #183E59 #256089 #3281B9

Accessibility & contrast

On white

11.22

#183E59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#183E59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E59

11.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E59	#FFFFFF	#000000	##FFFFFF
##183E59	1.00	11.22	1.87	11.22
#FFFFFF	11.22	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323E5A

Deuteranopia (green-blind)

#293859

Tritanopia (blue-blind)

#004547

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183e59;
/* rgb */ color: rgb(24, 62, 89);
/* oklch */ color: oklch(35.0% 0.064 242.6);

Tailwind

colors: {
  custom: {
    50: '#5e7388',
    500: '#183e59',
    950: '#000000',
  },
}

SCSS

$custom: #183e59;
$custom-light: #5e7388;
$custom-dark: #000000;

JSON

{
  "hex": "#183e59",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 89
  },
  "hsl": {
    "h": 204.923,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.35017,
    "c": 0.06384,
    "h": 242.6
  },
  "luminance": 0.04361
}

Semantic roles & 50–950 ramp

primary

#183E59

secondary

#905F3D

accent

#8747E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183E59

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

Preview Lab → · Contrast checker → · Palette generator →