#04183A#04183A

#04183A is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.7% C 0.071 H 259.5°. Best body text is #FFFFFF at 17.54:1 contrast (WCAG AA passes).

Color values

HEX	#04183A
RGB	rgb(4, 24, 58)
HSL	hsl(218, 87%, 12%)
HSV	hsv(218, 93%, 23%)
CMYK	cmyk(93.1%, 58.6%, 0%, 77.3%)
CIE-LAB	lab(8.86, 7.30, -24.35)
CIE-LCH	lch(8.86, 25.42, 286.68°)
OKLab	oklab(21.67% -0.013 -0.0701)
OKLCH	oklch(21.67% 0.071 259.5)
XYZ	xyz(1.1401, 0.9844, 4.1321)
Luminance	0.0098 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04183A #3A2604

analogous

#04333A #04183A #0B043A

triadic

#04183A #3A0418 #183A04

tetradic

#04183A #3A0433 #3A2604 #043A0B

square

#04183A #3A0433 #3A2604 #043A0B

split-complementary

#04183A #3A0B04 #333A04

monochromatic

#020C1D #020C1D #04183A #083073 #0C47AD

Accessibility & contrast

On white

17.54

#04183A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#04183A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04183A

17.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04183A	#FFFFFF	#000000	##FFFFFF
##04183A	1.00	17.54	1.20	17.54
#FFFFFF	17.54	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#041C3B

Deuteranopia (green-blind)

#001739

Tritanopia (blue-blind)

#002026

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #04183a;
/* rgb */ color: rgb(4, 24, 58);
/* oklch */ color: oklch(21.7% 0.071 259.5);

Tailwind

colors: {
  custom: {
    50: '#4e5470',
    500: '#04183a',
    950: '#000000',
  },
}

SCSS

$custom: #04183a;
$custom-light: #4e5470;
$custom-dark: #000000;

JSON

{
  "hex": "#04183a",
  "rgb": {
    "r": 4,
    "g": 24,
    "b": 58
  },
  "hsl": {
    "h": 217.778,
    "s": 87.097,
    "l": 12.157
  },
  "oklch": {
    "l": 0.21668,
    "c": 0.07132,
    "h": 259.5
  },
  "luminance": 0.00985
}

Semantic roles & 50–950 ramp

primary

#04183A

secondary

#7C591E

accent

#AF2BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #04183A

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

Preview Lab → · Contrast checker → · Palette generator →