#181B53#181B53

#181B53 is a dark, moderate blue. Relative luminance 0.016; OKLCH L 26.0% C 0.100 H 274.7°. Best body text is #FFFFFF at 15.90:1 contrast (WCAG AA passes).

Color values

HEX	#181B53
RGB	rgb(24, 27, 83)
HSL	hsl(237, 55%, 21%)
HSV	hsv(237, 71%, 33%)
CMYK	cmyk(71.1%, 67.5%, 0%, 67.5%)
CIE-LAB	lab(13.24, 19.18, -34.61)
CIE-LCH	lch(13.24, 39.57, 298.99°)
OKLab	oklab(25.99% 0.0081 -0.0997)
OKLCH	oklch(25.99% 0.1 274.7)
XYZ	xyz(2.3294, 1.6024, 8.3685)
Luminance	0.0160 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B53 #535018

analogous

#183853 #181B53 #321853

triadic

#181B53 #53181B #1B5318

tetradic

#181B53 #531838 #535018 #185332

square

#181B53 #531838 #535018 #185332

split-complementary

#181B53 #533218 #385318

monochromatic

#070818 #0A0C24 #181B53 #262A82 #333AB2

Accessibility & contrast

On white

15.90

#181B53 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.32

#181B53 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B53

15.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B53	#FFFFFF	#000000	##FFFFFF
##181B53	1.00	15.90	1.32	15.90
#FFFFFF	15.90	1.00	21.00	1.00
#000000	1.32	21.00	1.00	21.00
##FFFFFF	15.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002555

Deuteranopia (green-blind)

#001F52

Tritanopia (blue-blind)

#002934

Achromatopsia (no color)

#222222

Design tokens & code

CSS

--color: #181b53;
/* rgb */ color: rgb(24, 27, 83);
/* oklch */ color: oklch(26.0% 0.100 274.7);

Tailwind

colors: {
  custom: {
    50: '#5d5784',
    500: '#181b53',
    950: '#000000',
  },
}

SCSS

$custom: #181b53;
$custom-light: #5d5784;
$custom-dark: #000000;

JSON

{
  "hex": "#181b53",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 83
  },
  "hsl": {
    "h": 236.949,
    "s": 55.14,
    "l": 20.98
  },
  "oklch": {
    "l": 0.25985,
    "c": 0.10008,
    "h": 274.7
  },
  "luminance": 0.01603
}

Semantic roles & 50–950 ramp

primary

#181B53

secondary

#8A863D

accent

#D749DE

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #181B53

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

Preview Lab → · Contrast checker → · Palette generator →