#040A17#040A17

#040A17 is a very dark, muted blue. Relative luminance 0.003; OKLCH L 14.6% C 0.031 H 260.5°. Best body text is #FFFFFF at 19.79:1 contrast (WCAG AA passes).

Color values

HEX	#040A17
RGB	rgb(4, 10, 23)
HSL	hsl(221, 70%, 5%)
HSV	hsv(221, 83%, 9%)
CMYK	cmyk(82.6%, 56.5%, 0%, 91%)
CIE-LAB	lab(2.75, 0.97, -7.45)
CIE-LCH	lch(2.75, 7.51, 277.39°)
OKLab	oklab(14.56% -0.0051 -0.0304)
OKLCH	oklch(14.56% 0.031 260.5)
XYZ	xyz(0.3132, 0.3047, 0.8528)
Luminance	0.0031 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A17 #171104

analogous

#041317 #040A17 #070417

triadic

#040A17 #17040A #0A1704

tetradic

#040A17 #170413 #171104 #041707

square

#040A17 #170413 #171104 #041707

split-complementary

#040A17 #170704 #131704

monochromatic

#050B1A #050B1A #050B1A #0D214B #16377F

Accessibility & contrast

On white

19.79

#040A17 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.06

#040A17 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A17

19.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A17	#FFFFFF	#000000	##FFFFFF
##040A17	1.00	19.79	1.06	19.79
#FFFFFF	19.79	1.00	21.00	1.00
#000000	1.06	21.00	1.00	21.00
##FFFFFF	19.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#050B18

Deuteranopia (green-blind)

#040917

Tritanopia (blue-blind)

#000D0F

Achromatopsia (no color)

#0A0A0A

Design tokens & code

CSS

--color: #040a17;
/* rgb */ color: rgb(4, 10, 23);
/* oklch */ color: oklch(14.6% 0.031 260.5);

Tailwind

colors: {
  custom: {
    50: '#484b53',
    500: '#040a17',
    950: '#000000',
  },
}

SCSS

$custom: #040a17;
$custom-light: #484b53;
$custom-dark: #000000;

JSON

{
  "hex": "#040a17",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 23
  },
  "hsl": {
    "h": 221.053,
    "s": 70.37,
    "l": 5.294
  },
  "oklch": {
    "l": 0.14555,
    "c": 0.03083,
    "h": 260.5
  },
  "luminance": 0.00305
}

Semantic roles & 50–950 ramp

primary

#040A17

secondary

#59461E

accent

#B53BED

background

#F4F4F4

surface

#E6E7E7

border

#C2C3C3

text

#000102

muted

#777778

Preview Lab

Preview with #040A17

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

Preview Lab → · Contrast checker → · Palette generator →