#181B43#181B43

#181B43 is a very dark, moderate blue. Relative luminance 0.014; OKLCH L 24.5% C 0.074 H 276.2°. Best body text is #FFFFFF at 16.45:1 contrast (WCAG AA passes).

Color values

HEX	#181B43
RGB	rgb(24, 27, 67)
HSL	hsl(236, 47%, 18%)
HSV	hsv(236, 64%, 26%)
CMYK	cmyk(64.2%, 59.7%, 0%, 73.7%)
CIE-LAB	lab(11.85, 12.79, -25.84)
CIE-LCH	lch(11.85, 28.83, 296.33°)
OKLab	oklab(24.51% 0.008 -0.074)
OKLCH	oklch(24.51% 0.074 276.2)
XYZ	xyz(1.7814, 1.3832, 5.4822)
Luminance	0.0138 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B43 #434018

analogous

#183043 #181B43 #2A1843

triadic

#181B43 #43181B #1B4318

tetradic

#181B43 #431830 #434018 #18432A

square

#181B43 #431830 #434018 #18432A

split-complementary

#181B43 #432A18 #304318

monochromatic

#080917 #080917 #181B43 #282D70 #383F9D

Accessibility & contrast

On white

16.45

#181B43 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.28

#181B43 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B43

16.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B43	#FFFFFF	#000000	##FFFFFF
##181B43	1.00	16.45	1.28	16.45
#FFFFFF	16.45	1.00	21.00	1.00
#000000	1.28	21.00	1.00	21.00
##FFFFFF	16.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#052144

Deuteranopia (green-blind)

#001D42

Tritanopia (blue-blind)

#02242C

Achromatopsia (no color)

#1F1F1F

Design tokens & code

CSS

--color: #181b43;
/* rgb */ color: rgb(24, 27, 67);
/* oklch */ color: oklch(24.5% 0.074 276.2);

Tailwind

colors: {
  custom: {
    50: '#5a5777',
    500: '#181b43',
    950: '#000000',
  },
}

SCSS

$custom: #181b43;
$custom-light: #5a5777;
$custom-dark: #000000;

JSON

{
  "hex": "#181b43",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 67
  },
  "hsl": {
    "h": 235.814,
    "s": 47.253,
    "l": 17.843
  },
  "oklch": {
    "l": 0.24505,
    "c": 0.07441,
    "h": 276.2
  },
  "luminance": 0.01383
}

Semantic roles & 50–950 ramp

primary

#181B43

secondary

#7A753D

accent

#CE51D7

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#040309

muted

#79787B

Preview Lab

Preview with #181B43

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

Preview Lab → · Contrast checker → · Palette generator →