#181C81#181C81

#181C81 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.2% C 0.163 H 270.4°. Best body text is #FFFFFF at 13.80:1 contrast (WCAG AA passes).

Color values

HEX	#181C81
RGB	rgb(24, 28, 129)
HSL	hsl(238, 69%, 30%)
HSV	hsv(238, 81%, 51%)
CMYK	cmyk(81.4%, 78.3%, 0%, 49.4%)
CIE-LAB	lab(18.41, 35.91, -56.27)
CIE-LCH	lch(18.41, 66.75, 302.55°)
OKLab	oklab(31.18% 0.0012 -0.163)
OKLCH	oklch(31.18% 0.163 270.4)
XYZ	xyz(4.7530, 2.6091, 21.0177)
Luminance	0.0261 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181C81 #817D18

analogous

#185181 #181C81 #481881

triadic

#181C81 #81181C #1C8118

tetradic

#181C81 #811851 #817D18 #188148

square

#181C81 #811851 #817D18 #188148

split-complementary

#181C81 #814818 #518118

monochromatic

#05061A #0E114D #181C81 #2227B5 #393FDA

Accessibility & contrast

On white

13.80

#181C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#181C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181C81

13.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181C81	#FFFFFF	#000000	##FFFFFF
##181C81	1.00	13.80	1.52	13.80
#FFFFFF	13.80	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00287F

Tritanopia (blue-blind)

#003A4D

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #181c81;
/* rgb */ color: rgb(24, 28, 129);
/* oklch */ color: oklch(31.2% 0.163 270.4);

Tailwind

colors: {
  custom: {
    50: '#6a5aa7',
    500: '#181c81',
    950: '#000000',
  },
}

SCSS

$custom: #181c81;
$custom-light: #6a5aa7;
$custom-dark: #000000;

JSON

{
  "hex": "#181c81",
  "rgb": {
    "r": 24,
    "g": 28,
    "b": 129
  },
  "hsl": {
    "h": 237.714,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.31182,
    "c": 0.16296,
    "h": 270.4
  },
  "luminance": 0.0261
}

Semantic roles & 50–950 ramp

primary

#181C81

secondary

#B5B140

accent

#E53CEB

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080410

muted

#7A797F

Preview Lab

Preview with #181C81

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

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