#040F2B#040F2B

#040F2B is a very dark, muted blue. Relative luminance 0.005; OKLCH L 17.8% C 0.060 H 263.3°. Best body text is #FFFFFF at 18.95:1 contrast (WCAG AA passes).

Color values

HEX	#040F2B
RGB	rgb(4, 15, 43)
HSL	hsl(223, 83%, 9%)
HSV	hsv(223, 91%, 17%)
CMYK	cmyk(90.7%, 65.1%, 0%, 83.1%)
CIE-LAB	lab(4.89, 5.81, -19.70)
CIE-LCH	lch(4.89, 20.54, 286.43°)
OKLab	oklab(17.82% -0.0069 -0.0593)
OKLCH	oklch(17.82% 0.06 263.3)
XYZ	xyz(0.6568, 0.5418, 2.3550)
Luminance	0.0054 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.50

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2B #2B2004

analogous

#04232B #040F2B #0D042B

triadic

#040F2B #2B040F #0F2B04

tetradic

#040F2B #2B0423 #2B2004 #042B0D

square

#040F2B #2B0423 #2B2004 #042B0D

split-complementary

#040F2B #2B0D04 #232B04

monochromatic

#030A1C #030A1C #040F2B #092363 #0E369B

Accessibility & contrast

On white

18.95

#040F2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2B

18.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2B	#FFFFFF	#000000	##FFFFFF
##040F2B	1.00	18.95	1.11	18.95
#FFFFFF	18.95	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#01132C

Deuteranopia (green-blind)

#000F2A

Tritanopia (blue-blind)

#00161B

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040f2b;
/* rgb */ color: rgb(4, 15, 43);
/* oklch */ color: oklch(17.8% 0.060 263.3);

Tailwind

colors: {
  custom: {
    50: '#494d64',
    500: '#040f2b',
    950: '#000000',
  },
}

SCSS

$custom: #040f2b;
$custom-light: #494d64;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2b",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 43
  },
  "hsl": {
    "h": 223.077,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.17823,
    "c": 0.05972,
    "h": 263.3
  },
  "luminance": 0.00542
}

Semantic roles & 50–950 ramp

primary

#040F2B

secondary

#6E571D

accent

#C02EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040F2B

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

Preview Lab → · Contrast checker → · Palette generator →