#181F55#181F55

#181F55 is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.0% C 0.097 H 272.5°. Best body text is #FFFFFF at 15.37:1 contrast (WCAG AA passes).

Color values

HEX	#181F55
RGB	rgb(24, 31, 85)
HSL	hsl(233, 56%, 21%)
HSV	hsv(233, 72%, 33%)
CMYK	cmyk(71.8%, 63.5%, 0%, 66.7%)
CIE-LAB	lab(14.57, 17.06, -33.81)
CIE-LCH	lch(14.57, 37.87, 296.77°)
OKLab	oklab(27.02% 0.0042 -0.0974)
OKLCH	oklch(27.02% 0.097 272.5)
XYZ	xyz(2.5058, 1.8298, 8.8137)
Luminance	0.0183 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181F55 #554E18

analogous

#183E55 #181F55 #301855

triadic

#181F55 #55181F #1F5518

tetradic

#181F55 #55183E #554E18 #185530

square

#181F55 #55183E #554E18 #185530

split-complementary

#181F55 #553018 #3E5518

monochromatic

#070918 #0B0E25 #181F55 #253085 #3342B4

Accessibility & contrast

On white

15.37

#181F55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.37

#181F55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181F55

15.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181F55	#FFFFFF	#000000	##FFFFFF
##181F55	1.00	15.37	1.37	15.37
#FFFFFF	15.37	1.00	21.00	1.00
#000000	1.37	21.00	1.00	21.00
##FFFFFF	15.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002857

Deuteranopia (green-blind)

#002254

Tritanopia (blue-blind)

#002C36

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #181f55;
/* rgb */ color: rgb(24, 31, 85);
/* oklch */ color: oklch(27.0% 0.097 272.5);

Tailwind

colors: {
  custom: {
    50: '#5e5a85',
    500: '#181f55',
    950: '#000000',
  },
}

SCSS

$custom: #181f55;
$custom-light: #5e5a85;
$custom-dark: #000000;

JSON

{
  "hex": "#181f55",
  "rgb": {
    "r": 24,
    "g": 31,
    "b": 85
  },
  "hsl": {
    "h": 233.115,
    "s": 55.963,
    "l": 21.373
  },
  "oklch": {
    "l": 0.2702,
    "c": 0.09745,
    "h": 272.5
  },
  "luminance": 0.0183
}

Semantic roles & 50–950 ramp

primary

#181F55

secondary

#8C833D

accent

#CE49DF

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #181F55

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

Preview Lab → · Contrast checker → · Palette generator →