#040D2B#040D2B

#040D2B is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.3% C 0.063 H 265.4°. Best body text is #FFFFFF at 19.13:1 contrast (WCAG AA passes).

Color values

HEX	#040D2B
RGB	rgb(4, 13, 43)
HSL	hsl(226, 83%, 9%)
HSV	hsv(226, 91%, 17%)
CMYK	cmyk(90.7%, 69.8%, 0%, 83.1%)
CIE-LAB	lab(4.41, 6.80, -20.47)
CIE-LCH	lch(4.41, 21.57, 288.39°)
OKLab	oklab(17.29% -0.005 -0.0627)
OKLCH	oklch(17.29% 0.063 265.4)
XYZ	xyz(0.6299, 0.4880, 2.3460)
Luminance	0.0049 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.89

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040D2B #2B2204

analogous

#04212B #040D2B #0F042B

triadic

#040D2B #2B040D #0D2B04

tetradic

#040D2B #2B0421 #2B2204 #042B0F

square

#040D2B #2B0421 #2B2204 #042B0F

split-complementary

#040D2B #2B0F04 #212B04

monochromatic

#03081C #03081C #040D2B #091E63 #0E2F9B

Accessibility & contrast

On white

19.13

#040D2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040D2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040D2B

19.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040D2B	#FFFFFF	#000000	##FFFFFF
##040D2B	1.00	19.13	1.10	19.13
#FFFFFF	19.13	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00112C

Deuteranopia (green-blind)

#000D2A

Tritanopia (blue-blind)

#00141A

Achromatopsia (no color)

#0F0F0F

Design tokens & code

CSS

--color: #040d2b;
/* rgb */ color: rgb(4, 13, 43);
/* oklch */ color: oklch(17.3% 0.063 265.4);

Tailwind

colors: {
  custom: {
    50: '#494c64',
    500: '#040d2b',
    950: '#000000',
  },
}

SCSS

$custom: #040d2b;
$custom-light: #494c64;
$custom-dark: #000000;

JSON

{
  "hex": "#040d2b",
  "rgb": {
    "r": 4,
    "g": 13,
    "b": 43
  },
  "hsl": {
    "h": 226.154,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.17295,
    "c": 0.0629,
    "h": 265.4
  },
  "luminance": 0.00488
}

Semantic roles & 50–950 ramp

primary

#040D2B

secondary

#6E5B1D

accent

#CB2EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040D2B

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

Preview Lab → · Contrast checker → · Palette generator →