#183B57#183B57

#183B57 is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.1% C 0.064 H 245.4°. Best body text is #FFFFFF at 11.65:1 contrast (WCAG AA passes).

Color values

HEX	#183B57
RGB	rgb(24, 59, 87)
HSL	hsl(207, 57%, 22%)
HSV	hsv(207, 72%, 34%)
CMYK	cmyk(72.4%, 32.2%, 0%, 65.9%)
CIE-LAB	lab(23.70, -2.29, -20.55)
CIE-LCH	lch(23.70, 20.68, 263.64°)
OKLab	oklab(34.09% -0.0265 -0.058)
OKLCH	oklch(34.09% 0.064 245.4)
XYZ	xyz(3.6603, 4.0099, 9.5961)
Luminance	0.0401 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B57 #573418

analogous

#185754 #183B57 #181B57

triadic

#183B57 #57183B #3B5718

tetradic

#183B57 #541857 #573418 #1B5718

square

#183B57 #541857 #573418 #1B5718

split-complementary

#183B57 #57181B #575418

monochromatic

#071018 #0B1A27 #183B57 #255C87 #327CB7

Accessibility & contrast

On white

11.65

#183B57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#183B57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B57

11.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B57	#FFFFFF	#000000	##FFFFFF
##183B57	1.00	11.65	1.80	11.65
#FFFFFF	11.65	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3C58

Deuteranopia (green-blind)

#263656

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183b57;
/* rgb */ color: rgb(24, 59, 87);
/* oklch */ color: oklch(34.1% 0.064 245.4);

Tailwind

colors: {
  custom: {
    50: '#5d7086',
    500: '#183b57',
    950: '#000000',
  },
}

SCSS

$custom: #183b57;
$custom-light: #5d7086;
$custom-dark: #000000;

JSON

{
  "hex": "#183b57",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 87
  },
  "hsl": {
    "h": 206.667,
    "s": 56.757,
    "l": 21.765
  },
  "oklch": {
    "l": 0.34093,
    "c": 0.06381,
    "h": 245.4
  },
  "luminance": 0.0401
}

Semantic roles & 50–950 ramp

primary

#183B57

secondary

#8E613D

accent

#8B48E0

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B57

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

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