#181B81#181B81

#181B81 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.0% C 0.164 H 270.6°. Best body text is #FFFFFF at 13.88:1 contrast (WCAG AA passes).

Color values

HEX	#181B81
RGB	rgb(24, 27, 129)
HSL	hsl(238, 69%, 30%)
HSV	hsv(238, 81%, 51%)
CMYK	cmyk(81.4%, 79.1%, 0%, 49.4%)
CIE-LAB	lab(18.20, 36.50, -56.61)
CIE-LCH	lch(18.20, 67.35, 302.81°)
OKLab	oklab(31.04% 0.0016 -0.1639)
OKLCH	oklch(31.04% 0.164 270.6)
XYZ	xyz(4.7297, 2.5625, 21.0100)
Luminance	0.0256 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B81 #817E18

analogous

#184F81 #181B81 #4A1881

triadic

#181B81 #81181B #1B8118

tetradic

#181B81 #81184F #817E18 #18814A

square

#181B81 #81184F #817E18 #18814A

split-complementary

#181B81 #814A18 #4F8118

monochromatic

#05051A #0E104D #181B81 #2226B5 #393EDA

Accessibility & contrast

On white

13.88

#181B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.51

#181B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B81

13.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B81	#FFFFFF	#000000	##FFFFFF
##181B81	1.00	13.88	1.51	13.88
#FFFFFF	13.88	1.00	21.00	1.00
#000000	1.51	21.00	1.00	21.00
##FFFFFF	13.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00277F

Tritanopia (blue-blind)

#003A4D

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #181b81;
/* rgb */ color: rgb(24, 27, 129);
/* oklch */ color: oklch(31.0% 0.164 270.6);

Tailwind

colors: {
  custom: {
    50: '#6a59a7',
    500: '#181b81',
    950: '#000000',
  },
}

SCSS

$custom: #181b81;
$custom-light: #6a59a7;
$custom-dark: #000000;

JSON

{
  "hex": "#181b81",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 129
  },
  "hsl": {
    "h": 238.286,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.31036,
    "c": 0.16395,
    "h": 270.6
  },
  "luminance": 0.02563
}

Semantic roles & 50–950 ramp

primary

#181B81

secondary

#B5B240

accent

#E63CEB

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080310

muted

#7A787F

Preview Lab

Preview with #181B81

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

Preview Lab → · Contrast checker → · Palette generator →