#040B18#040B18

#040B18 is a very dark, muted blue. Relative luminance 0.003; OKLCH L 14.9% C 0.031 H 258.4°. Best body text is #FFFFFF at 19.70:1 contrast (WCAG AA passes).

Color values

HEX	#040B18
RGB	rgb(4, 11, 24)
HSL	hsl(219, 71%, 5%)
HSV	hsv(219, 83%, 9%)
CMYK	cmyk(83.3%, 54.2%, 0%, 90.6%)
CIE-LAB	lab(2.99, 0.82, -7.86)
CIE-LCH	lch(2.99, 7.90, 275.92°)
OKLab	oklab(14.95% -0.0063 -0.0306)
OKLCH	oklch(14.95% 0.031 258.4)
XYZ	xyz(0.3346, 0.3311, 0.9102)
Luminance	0.0033 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B18 #181104

analogous

#041518 #040B18 #070418

triadic

#040B18 #18040B #0B1804

tetradic

#040B18 #180415 #181104 #041807

square

#040B18 #180415 #181104 #041807

split-complementary

#040B18 #180704 #151804

monochromatic

#040C1A #040C1A #040C1A #0D234C #153B81

Accessibility & contrast

On white

19.70

#040B18 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.07

#040B18 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B18

19.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B18	#FFFFFF	#000000	##FFFFFF
##040B18	1.00	19.70	1.07	19.70
#FFFFFF	19.70	1.00	21.00	1.00
#000000	1.07	21.00	1.00	21.00
##FFFFFF	19.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#060C19

Deuteranopia (green-blind)

#040A18

Tritanopia (blue-blind)

#000E10

Achromatopsia (no color)

#0B0B0B

Design tokens & code

CSS

--color: #040b18;
/* rgb */ color: rgb(4, 11, 24);
/* oklch */ color: oklch(14.9% 0.031 258.4);

Tailwind

colors: {
  custom: {
    50: '#484c54',
    500: '#040b18',
    950: '#000000',
  },
}

SCSS

$custom: #040b18;
$custom-light: #484c54;
$custom-dark: #000000;

JSON

{
  "hex": "#040b18",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 24
  },
  "hsl": {
    "h": 219,
    "s": 71.429,
    "l": 5.49
  },
  "oklch": {
    "l": 0.14945,
    "c": 0.03121,
    "h": 258.4
  },
  "luminance": 0.00331
}

Semantic roles & 50–950 ramp

primary

#040B18

secondary

#5A451E

accent

#AF3AEE

background

#F4F4F4

surface

#E6E7E7

border

#C2C3C3

text

#000102

muted

#777778

Preview Lab

Preview with #040B18

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

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