#04183C#04183C

#04183C is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.9% C 0.075 H 260.2°. Best body text is #FFFFFF at 17.49:1 contrast (WCAG AA passes).

Color values

HEX	#04183C
RGB	rgb(4, 24, 60)
HSL	hsl(219, 88%, 13%)
HSV	hsv(219, 93%, 24%)
CMYK	cmyk(93.3%, 60%, 0%, 76.5%)
CIE-LAB	lab(9.03, 8.26, -25.50)
CIE-LCH	lch(9.03, 26.80, 287.95°)
OKLab	oklab(21.86% -0.0127 -0.0735)
OKLCH	oklch(21.86% 0.075 260.2)
XYZ	xyz(1.1920, 1.0052, 4.4053)
Luminance	0.0100 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04183C #3C2804

analogous

#04343C #04183C #0C043C

triadic

#04183C #3C0418 #183C04

tetradic

#04183C #3C0434 #3C2804 #043C0C

square

#04183C #3C0434 #3C2804 #043C0C

split-complementary

#04183C #3C0C04 #343C04

monochromatic

#020B1D #020B1D #04183C #082F75 #0C46AF

Accessibility & contrast

On white

17.49

#04183C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#04183C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04183C

17.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04183C	#FFFFFF	#000000	##FFFFFF
##04183C	1.00	17.49	1.20	17.49
#FFFFFF	17.49	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#021C3D

Deuteranopia (green-blind)

#00173B

Tritanopia (blue-blind)

#002127

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #04183c;
/* rgb */ color: rgb(4, 24, 60);
/* oklch */ color: oklch(21.9% 0.075 260.2);

Tailwind

colors: {
  custom: {
    50: '#4f5472',
    500: '#04183c',
    950: '#000000',
  },
}

SCSS

$custom: #04183c;
$custom-light: #4f5472;
$custom-dark: #000000;

JSON

{
  "hex": "#04183c",
  "rgb": {
    "r": 4,
    "g": 24,
    "b": 60
  },
  "hsl": {
    "h": 218.571,
    "s": 87.5,
    "l": 12.549
  },
  "oklch": {
    "l": 0.21855,
    "c": 0.0746,
    "h": 260.2
  },
  "luminance": 0.01005
}

Semantic roles & 50–950 ramp

primary

#04183C

secondary

#7E5C1E

accent

#B22AFE

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020208

muted

#78787B

Preview Lab

Preview with #04183C

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

Preview Lab → · Contrast checker → · Palette generator →