#183571#183571

#183571 is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.4% C 0.110 H 262.7°. Best body text is #FFFFFF at 11.75:1 contrast (WCAG AA passes).

Color values

HEX	#183571
RGB	rgb(24, 53, 113)
HSL	hsl(220, 65%, 27%)
HSV	hsv(220, 79%, 44%)
CMYK	cmyk(78.8%, 53.1%, 0%, 55.7%)
CIE-LAB	lab(23.45, 12.57, -37.83)
CIE-LCH	lch(23.45, 39.86, 288.39°)
OKLab	oklab(34.44% -0.014 -0.1088)
OKLCH	oklch(34.44% 0.11 262.7)
XYZ	xyz(4.6294, 3.9321, 16.1346)
Luminance	0.0393 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183571 #715418

analogous

#186271 #183571 #271871

triadic

#183571 #711835 #357118

tetradic

#183571 #711862 #715418 #187127

square

#183571 #711862 #715418 #187127

split-complementary

#183571 #712718 #627118

monochromatic

#050C19 #0D1D3F #183571 #234DA3 #3065D3

Accessibility & contrast

On white

11.75

#183571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#183571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183571

11.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183571	#FFFFFF	#000000	##FFFFFF
##183571	1.00	11.75	1.79	11.75
#FFFFFF	11.75	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#103C73

Deuteranopia (green-blind)

#003470

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183571;
/* rgb */ color: rgb(24, 53, 113);
/* oklch */ color: oklch(34.4% 0.110 262.7);

Tailwind

colors: {
  custom: {
    50: '#636b9a',
    500: '#183571',
    950: '#000000',
  },
}

SCSS

$custom: #183571;
$custom-light: #636b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#183571",
  "rgb": {
    "r": 24,
    "g": 53,
    "b": 113
  },
  "hsl": {
    "h": 220.449,
    "s": 64.964,
    "l": 26.863
  },
  "oklch": {
    "l": 0.34435,
    "c": 0.10969,
    "h": 262.7
  },
  "luminance": 0.03933
}

Semantic roles & 50–950 ramp

primary

#183571

secondary

#A6853E

accent

#B140E8

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #183571

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

Preview Lab → · Contrast checker → · Palette generator →