#04182B#04182B

#04182B is a very dark, muted cyan. Relative luminance 0.009; OKLCH L 20.4% C 0.047 H 248.9°. Best body text is #FFFFFF at 17.94:1 contrast (WCAG AA passes).

Color values

HEX	#04182B
RGB	rgb(4, 24, 43)
HSL	hsl(209, 83%, 9%)
HSV	hsv(209, 91%, 17%)
CMYK	cmyk(90.7%, 44.2%, 0%, 83.1%)
CIE-LAB	lab(7.71, 0.06, -15.25)
CIE-LCH	lch(7.71, 15.25, 270.23°)
OKLab	oklab(20.4% -0.0168 -0.0434)
OKLCH	oklch(20.4% 0.047 248.9)
XYZ	xyz(0.8126, 0.8534, 2.4069)
Luminance	0.0085 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04182B #2B1704

analogous

#042B2B #04182B #04042B

triadic

#04182B #2B0418 #182B04

tetradic

#04182B #2B042B #2B1704 #042B04

square

#04182B #2B042B #2B1704 #042B04

split-complementary

#04182B #2B0404 #2B2B04

monochromatic

#03101C #03101C #04182B #093763 #0E579B

Accessibility & contrast

On white

17.94

#04182B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.17

#04182B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04182B

17.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04182B	#FFFFFF	#000000	##FFFFFF
##04182B	1.00	17.94	1.17	17.94
#FFFFFF	17.94	1.00	21.00	1.00
#000000	1.17	21.00	1.00	21.00
##FFFFFF	17.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F192C

Deuteranopia (green-blind)

#09152B

Tritanopia (blue-blind)

#001D1F

Achromatopsia (no color)

#171717

Design tokens & code

CSS

--color: #04182b;
/* rgb */ color: rgb(4, 24, 43);
/* oklch */ color: oklch(20.4% 0.047 248.9);

Tailwind

colors: {
  custom: {
    50: '#4a5464',
    500: '#04182b',
    950: '#000000',
  },
}

SCSS

$custom: #04182b;
$custom-light: #4a5464;
$custom-dark: #000000;

JSON

{
  "hex": "#04182b",
  "rgb": {
    "r": 4,
    "g": 24,
    "b": 43
  },
  "hsl": {
    "h": 209.231,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.204,
    "c": 0.04656,
    "h": 248.9
  },
  "luminance": 0.00853
}

Semantic roles & 50–950 ramp

primary

#04182B

secondary

#6E441D

accent

#912EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010205

muted

#77787A

Preview Lab

Preview with #04182B

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

Preview Lab → · Contrast checker → · Palette generator →