#181F81#181F81

#181F81 is a dark, vivid blue. Relative luminance 0.028; OKLCH L 31.6% C 0.160 H 270.0°. Best body text is #FFFFFF at 13.53:1 contrast (WCAG AA passes).

Color values

HEX	#181F81
RGB	rgb(24, 31, 129)
HSL	hsl(236, 69%, 30%)
HSV	hsv(236, 81%, 51%)
CMYK	cmyk(81.4%, 76%, 0%, 49.4%)
CIE-LAB	lab(19.05, 34.09, -55.20)
CIE-LCH	lch(19.05, 64.88, 301.70°)
OKLab	oklab(31.64% 0.0001 -0.1599)
OKLCH	oklch(31.64% 0.16 270)
XYZ	xyz(4.8278, 2.7586, 21.0426)
Luminance	0.0276 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181F81 #817A18

analogous

#185381 #181F81 #461881

triadic

#181F81 #81181F #1F8118

tetradic

#181F81 #811853 #817A18 #188146

square

#181F81 #811853 #817A18 #188146

split-complementary

#181F81 #814618 #538118

monochromatic

#05061A #0E134D #181F81 #222BB5 #3944DA

Accessibility & contrast

On white

13.53

#181F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#181F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181F81

13.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181F81	#FFFFFF	#000000	##FFFFFF
##181F81	1.00	13.53	1.55	13.53
#FFFFFF	13.53	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003384

Deuteranopia (green-blind)

#00297F

Tritanopia (blue-blind)

#003B4E

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #181f81;
/* rgb */ color: rgb(24, 31, 129);
/* oklch */ color: oklch(31.6% 0.160 270.0);

Tailwind

colors: {
  custom: {
    50: '#6a5ba7',
    500: '#181f81',
    950: '#000000',
  },
}

SCSS

$custom: #181f81;
$custom-light: #6a5ba7;
$custom-dark: #000000;

JSON

{
  "hex": "#181f81",
  "rgb": {
    "r": 24,
    "g": 31,
    "b": 129
  },
  "hsl": {
    "h": 236,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.3164,
    "c": 0.15989,
    "h": 270
  },
  "luminance": 0.02759
}

Semantic roles & 50–950 ramp

primary

#181F81

secondary

#B5AD40

accent

#E03CEB

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080410

muted

#7A797F

Preview Lab

Preview with #181F81

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

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