#181B40#181B40

#181B40 is a very dark, moderate blue. Relative luminance 0.013; OKLCH L 24.3% C 0.069 H 276.4°. Best body text is #FFFFFF at 16.54:1 contrast (WCAG AA passes).

Color values

HEX	#181B40
RGB	rgb(24, 27, 64)
HSL	hsl(236, 45%, 17%)
HSV	hsv(236, 63%, 25%)
CMYK	cmyk(62.5%, 57.8%, 0%, 74.9%)
CIE-LAB	lab(11.61, 11.60, -24.12)
CIE-LCH	lch(11.61, 26.76, 295.68°)
OKLab	oklab(24.25% 0.0078 -0.0689)
OKLCH	oklch(24.25% 0.069 276.4)
XYZ	xyz(1.6937, 1.3481, 5.0205)
Luminance	0.0135 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#181B40 #403D18

analogous

#182F40 #181B40 #291840

triadic

#181B40 #40181B #1B4018

tetradic

#181B40 #40182F #403D18 #184029

square

#181B40 #40182F #403D18 #184029

split-complementary

#181B40 #402918 #2F4018

monochromatic

#080916 #080916 #181B40 #292E6D #394199

Accessibility & contrast

On white

16.54

#181B40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.27

#181B40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #181B40

16.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##181B40	#FFFFFF	#000000	##FFFFFF
##181B40	1.00	16.54	1.27	16.54
#FFFFFF	16.54	1.00	21.00	1.00
#000000	1.27	21.00	1.00	21.00
##FFFFFF	16.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#082041

Deuteranopia (green-blind)

#041D3F

Tritanopia (blue-blind)

#05232A

Achromatopsia (no color)

#1F1F1F

Design tokens & code

CSS

--color: #181b40;
/* rgb */ color: rgb(24, 27, 64);
/* oklch */ color: oklch(24.3% 0.069 276.4);

Tailwind

colors: {
  custom: {
    50: '#595775',
    500: '#181b40',
    950: '#000000',
  },
}

SCSS

$custom: #181b40;
$custom-light: #595775;
$custom-dark: #000000;

JSON

{
  "hex": "#181b40",
  "rgb": {
    "r": 24,
    "g": 27,
    "b": 64
  },
  "hsl": {
    "h": 235.5,
    "s": 45.455,
    "l": 17.255
  },
  "oklch": {
    "l": 0.24251,
    "c": 0.06933,
    "h": 276.4
  },
  "luminance": 0.01348
}

Semantic roles & 50–950 ramp

primary

#181B40

secondary

#77723D

accent

#CB53D5

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#040308

muted

#79787B

Preview Lab

Preview with #181B40

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

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