#181C55#181C55

#181C55 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.4% C 0.102 H 274.0°. Best body text is #FFFFFF at 15.72:1 contrast (WCAG AA passes).

Color values

HEX	#181C55
RGB	rgb(24, 28, 85)
HSL	hsl(236, 56%, 21%)
HSV	hsv(236, 72%, 33%)
CMYK	cmyk(71.8%, 67.1%, 0%, 66.7%)
CIE-LAB	lab(13.71, 19.25, -35.21)
CIE-LCH	lch(13.71, 40.13, 298.67°)
OKLab	oklab(26.39% 0.0071 -0.1015)
OKLCH	oklch(26.39% 0.102 274)
XYZ	xyz(2.4311, 1.6804, 8.7888)
Luminance	0.0168 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181C55 #555118

analogous

#183B55 #181C55 #331855

triadic

#181C55 #55181C #1C5518

tetradic

#181C55 #55183B #555118 #185533

square

#181C55 #55183B #555118 #185533

split-complementary

#181C55 #553318 #3B5518

monochromatic

#070818 #0B0C25 #181C55 #252C85 #333BB4

Accessibility & contrast

On white

15.72

#181C55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#181C55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181C55

15.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181C55	#FFFFFF	#000000	##FFFFFF
##181C55	1.00	15.72	1.34	15.72
#FFFFFF	15.72	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002657

Deuteranopia (green-blind)

#002054

Tritanopia (blue-blind)

#002A35

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #181c55;
/* rgb */ color: rgb(24, 28, 85);
/* oklch */ color: oklch(26.4% 0.102 274.0);

Tailwind

colors: {
  custom: {
    50: '#5e5885',
    500: '#181c55',
    950: '#000000',
  },
}

SCSS

$custom: #181c55;
$custom-light: #5e5885;
$custom-dark: #000000;

JSON

{
  "hex": "#181c55",
  "rgb": {
    "r": 24,
    "g": 28,
    "b": 85
  },
  "hsl": {
    "h": 236.066,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.26387,
    "c": 0.10174,
    "h": 274
  },
  "luminance": 0.01681
}

Semantic roles & 50–950 ramp

primary

#181C55

secondary

#8C873D

accent

#D549DF

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #181C55

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

Preview Lab → · Contrast checker → · Palette generator →