#181F59#181F59

#181F59 is a dark, moderate blue. Relative luminance 0.019; OKLCH L 27.4% C 0.104 H 272.3°. Best body text is #FFFFFF at 15.23:1 contrast (WCAG AA passes).

Color values

HEX	#181F59
RGB	rgb(24, 31, 89)
HSL	hsl(234, 58%, 22%)
HSV	hsv(234, 73%, 35%)
CMYK	cmyk(73%, 65.2%, 0%, 65.1%)
CIE-LAB	lab(14.93, 18.67, -35.92)
CIE-LCH	lch(14.93, 40.48, 297.46°)
OKLab	oklab(27.4% 0.0042 -0.1036)
OKLCH	oklch(27.4% 0.104 272.3)
XYZ	xyz(2.6692, 1.8952, 9.6744)
Luminance	0.0190 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181F59 #595218

analogous

#184059 #181F59 #311859

triadic

#181F59 #59181F #1F5918

tetradic

#181F59 #591840 #595218 #185931

square

#181F59 #591840 #595218 #185931

split-complementary

#181F59 #593118 #405918

monochromatic

#060818 #0B0E29 #181F59 #253089 #3241B9

Accessibility & contrast

On white

15.23

#181F59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.38

#181F59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181F59

15.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181F59	#FFFFFF	#000000	##FFFFFF
##181F59	1.00	15.23	1.38	15.23
#FFFFFF	15.23	1.00	21.00	1.00
#000000	1.38	21.00	1.00	21.00
##FFFFFF	15.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00295B

Deuteranopia (green-blind)

#002358

Tritanopia (blue-blind)

#002E38

Achromatopsia (no color)

#262626

Design tokens & code

CSS

--color: #181f59;
/* rgb */ color: rgb(24, 31, 89);
/* oklch */ color: oklch(27.4% 0.104 272.3);

Tailwind

colors: {
  custom: {
    50: '#5f5a88',
    500: '#181f59',
    950: '#000000',
  },
}

SCSS

$custom: #181f59;
$custom-light: #5f5a88;
$custom-dark: #000000;

JSON

{
  "hex": "#181f59",
  "rgb": {
    "r": 24,
    "g": 31,
    "b": 89
  },
  "hsl": {
    "h": 233.538,
    "s": 57.522,
    "l": 22.157
  },
  "oklch": {
    "l": 0.274,
    "c": 0.10364,
    "h": 272.3
  },
  "luminance": 0.01895
}

Semantic roles & 50–950 ramp

primary

#181F59

secondary

#90873D

accent

#D047E1

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030B

muted

#79787C

Preview Lab

Preview with #181F59

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

Preview Lab → · Contrast checker → · Palette generator →