#040F2A#040F2A

#040F2A is a very dark, muted blue. Relative luminance 0.005; OKLCH L 17.7% C 0.058 H 263.0°. Best body text is #FFFFFF at 18.97:1 contrast (WCAG AA passes).

Color values

HEX	#040F2A
RGB	rgb(4, 15, 42)
HSL	hsl(223, 83%, 9%)
HSV	hsv(223, 90%, 16%)
CMYK	cmyk(90.5%, 64.3%, 0%, 83.5%)
CIE-LAB	lab(4.83, 5.35, -19.05)
CIE-LCH	lch(4.83, 19.79, 285.69°)
OKLab	oklab(17.72% -0.0071 -0.0575)
OKLCH	oklch(17.72% 0.058 263)
XYZ	xyz(0.6387, 0.5346, 2.2596)
Luminance	0.0053 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.84

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2A #2A1F04

analogous

#04222A #040F2A #0C042A

triadic

#040F2A #2A040F #0F2A04

tetradic

#040F2A #2A0422 #2A1F04 #042A0C

square

#040F2A #2A0422 #2A1F04 #042A0C

split-complementary

#040F2A #2A0C04 #222A04

monochromatic

#030A1C #030A1C #040F2A #092362 #0F379A

Accessibility & contrast

On white

18.97

#040F2A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2A

18.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2A	#FFFFFF	#000000	##FFFFFF
##040F2A	1.00	18.97	1.11	18.97
#FFFFFF	18.97	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#02122B

Deuteranopia (green-blind)

#000F29

Tritanopia (blue-blind)

#00161A

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040f2a;
/* rgb */ color: rgb(4, 15, 42);
/* oklch */ color: oklch(17.7% 0.058 263.0);

Tailwind

colors: {
  custom: {
    50: '#494e63',
    500: '#040f2a',
    950: '#000000',
  },
}

SCSS

$custom: #040f2a;
$custom-light: #494e63;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2a",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 42
  },
  "hsl": {
    "h": 222.632,
    "s": 82.609,
    "l": 9.02
  },
  "oklch": {
    "l": 0.17725,
    "c": 0.05797,
    "h": 263
  },
  "luminance": 0.00535
}

Semantic roles & 50–950 ramp

primary

#040F2A

secondary

#6D561D

accent

#BE2FF9

background

#F4F4F5

surface

#E7E7EA

border

#C3C3C6

text

#010105

muted

#777779

Preview Lab

Preview with #040F2A

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

Preview Lab → · Contrast checker → · Palette generator →