#181D81#181D81

#181D81 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.3% C 0.162 H 270.3°. Best body text is #FFFFFF at 13.71:1 contrast (WCAG AA passes).

Color values

HEX	#181D81
RGB	rgb(24, 29, 129)
HSL	hsl(237, 69%, 30%)
HSV	hsv(237, 81%, 51%)
CMYK	cmyk(81.4%, 77.5%, 0%, 49.4%)
CIE-LAB	lab(18.62, 35.32, -55.92)
CIE-LCH	lch(18.62, 66.14, 302.27°)
OKLab	oklab(31.33% 0.0009 -0.162)
OKLCH	oklch(31.33% 0.162 270.3)
XYZ	xyz(4.7772, 2.6574, 21.0258)
Luminance	0.0266 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181D81 #817C18

analogous

#185181 #181D81 #481881

triadic

#181D81 #81181D #1D8118

tetradic

#181D81 #811851 #817C18 #188148

square

#181D81 #811851 #817C18 #188148

split-complementary

#181D81 #814818 #518118

monochromatic

#05061A #0E114D #181D81 #2229B5 #3941DA

Accessibility & contrast

On white

13.71

#181D81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#181D81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181D81

13.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181D81	#FFFFFF	#000000	##FFFFFF
##181D81	1.00	13.71	1.53	13.71
#FFFFFF	13.71	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00287F

Tritanopia (blue-blind)

#003B4E

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #181d81;
/* rgb */ color: rgb(24, 29, 129);
/* oklch */ color: oklch(31.3% 0.162 270.3);

Tailwind

colors: {
  custom: {
    50: '#6a5aa7',
    500: '#181d81',
    950: '#000000',
  },
}

SCSS

$custom: #181d81;
$custom-light: #6a5aa7;
$custom-dark: #000000;

JSON

{
  "hex": "#181d81",
  "rgb": {
    "r": 24,
    "g": 29,
    "b": 129
  },
  "hsl": {
    "h": 237.143,
    "s": 68.627,
    "l": 30
  },
  "oklch": {
    "l": 0.31331,
    "c": 0.16196,
    "h": 270.3
  },
  "luminance": 0.02658
}

Semantic roles & 50–950 ramp

primary

#181D81

secondary

#B5B040

accent

#E33CEB

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080410

muted

#7A797F

Preview Lab

Preview with #181D81

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

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