#181551#181551

#181551 is a very dark, moderate blue. Relative luminance 0.013; OKLCH L 24.6% C 0.105 H 277.5°. Best body text is #FFFFFF at 16.60:1 contrast (WCAG AA passes).

Color values

HEX	#181551
RGB	rgb(24, 21, 81)
HSL	hsl(243, 59%, 20%)
HSV	hsv(243, 74%, 32%)
CMYK	cmyk(70.4%, 74.1%, 0%, 68.2%)
CIE-LAB	lab(11.45, 22.66, -36.19)
CIE-LCH	lch(11.45, 42.70, 302.05°)
OKLab	oklab(24.61% 0.0138 -0.1044)
OKLCH	oklch(24.61% 0.105 277.5)
XYZ	xyz(2.1296, 1.3244, 7.9264)
Luminance	0.0132 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181551 #4E5115

analogous

#153051 #181551 #361551

triadic

#181551 #511815 #155118

tetradic

#181551 #511530 #4E5115 #155136

square

#181551 #511530 #4E5115 #155136

split-complementary

#181551 #513615 #305115

monochromatic

#070618 #0A0820 #181551 #262282 #352EB2

Accessibility & contrast

On white

16.60

#181551 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.26

#181551 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181551

16.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181551	#FFFFFF	#000000	##FFFFFF
##181551	1.00	16.60	1.26	16.60
#FFFFFF	16.60	1.00	21.00	1.00
#000000	1.26	21.00	1.00	21.00
##FFFFFF	16.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002153

Deuteranopia (green-blind)

#001C50

Tritanopia (blue-blind)

#002531

Achromatopsia (no color)

#1E1E1E

Design tokens & code

CSS

--color: #181551;
/* rgb */ color: rgb(24, 21, 81);
/* oklch */ color: oklch(24.6% 0.105 277.5);

Tailwind

colors: {
  custom: {
    50: '#5e5382',
    500: '#181551',
    950: '#000000',
  },
}

SCSS

$custom: #181551;
$custom-light: #5e5382;
$custom-dark: #000000;

JSON

{
  "hex": "#181551",
  "rgb": {
    "r": 24,
    "g": 21,
    "b": 81
  },
  "hsl": {
    "h": 243,
    "s": 58.824,
    "l": 20
  },
  "oklch": {
    "l": 0.24613,
    "c": 0.10532,
    "h": 277.5
  },
  "luminance": 0.01325
}

Semantic roles & 50–950 ramp

primary

#181551

secondary

#858939

accent

#E246DA

background

#F5F4F8

surface

#E9E7EF

border

#C5C3CA

text

#05020A

muted

#79787C

Preview Lab

Preview with #181551

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

Preview Lab → · Contrast checker → · Palette generator →