#04183B#04183B

#04183B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.8% C 0.073 H 259.9°. Best body text is #FFFFFF at 17.51:1 contrast (WCAG AA passes).

Color values

HEX	#04183B
RGB	rgb(4, 24, 59)
HSL	hsl(218, 87%, 12%)
HSV	hsv(218, 93%, 23%)
CMYK	cmyk(93.2%, 59.3%, 0%, 76.9%)
CIE-LAB	lab(8.95, 7.78, -24.92)
CIE-LCH	lch(8.95, 26.11, 287.33°)
OKLab	oklab(21.76% -0.0128 -0.0718)
OKLCH	oklch(21.76% 0.073 259.9)
XYZ	xyz(1.1658, 0.9947, 4.2674)
Luminance	0.0100 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04183B #3B2704

analogous

#04343B #04183B #0C043B

triadic

#04183B #3B0418 #183B04

tetradic

#04183B #3B0434 #3B2704 #043B0C

square

#04183B #3B0434 #3B2704 #043B0C

split-complementary

#04183B #3B0C04 #343B04

monochromatic

#020C1D #020C1D #04183B #082F74 #0C47AE

Accessibility & contrast

On white

17.51

#04183B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#04183B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04183B

17.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04183B	#FFFFFF	#000000	##FFFFFF
##04183B	1.00	17.51	1.20	17.51
#FFFFFF	17.51	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#031C3C

Deuteranopia (green-blind)

#00173A

Tritanopia (blue-blind)

#002126

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #04183b;
/* rgb */ color: rgb(4, 24, 59);
/* oklch */ color: oklch(21.8% 0.073 259.9);

Tailwind

colors: {
  custom: {
    50: '#4f5471',
    500: '#04183b',
    950: '#000000',
  },
}

SCSS

$custom: #04183b;
$custom-light: #4f5471;
$custom-dark: #000000;

JSON

{
  "hex": "#04183b",
  "rgb": {
    "r": 4,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 218.182,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.21761,
    "c": 0.07296,
    "h": 259.9
  },
  "luminance": 0.00995
}

Semantic roles & 50–950 ramp

primary

#04183B

secondary

#7D5A1E

accent

#B12AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #04183B

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

Preview Lab → · Contrast checker → · Palette generator →