#040B2B#040B2B

#040B2B is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.8% C 0.066 H 267.2°. Best body text is #FFFFFF at 19.30:1 contrast (WCAG AA passes).

Color values

HEX	#040B2B
RGB	rgb(4, 11, 43)
HSL	hsl(229, 83%, 9%)
HSV	hsv(229, 91%, 17%)
CMYK	cmyk(90.7%, 74.4%, 0%, 83.1%)
CIE-LAB	lab(3.97, 7.70, -21.16)
CIE-LCH	lch(3.97, 22.51, 289.99°)
OKLab	oklab(16.79% -0.0033 -0.066)
OKLCH	oklch(16.79% 0.066 267.2)
XYZ	xyz(0.6056, 0.4395, 2.3379)
Luminance	0.0044 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.36

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B2B #2B2404

analogous

#041F2B #040B2B #11042B

triadic

#040B2B #2B040B #0B2B04

tetradic

#040B2B #2B041F #2B2404 #042B11

square

#040B2B #2B041F #2B2404 #042B11

split-complementary

#040B2B #2B1104 #1F2B04

monochromatic

#03071C #03071C #040B2B #091963 #0E289B

Accessibility & contrast

On white

19.30

#040B2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040B2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B2B

19.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B2B	#FFFFFF	#000000	##FFFFFF
##040B2B	1.00	19.30	1.09	19.30
#FFFFFF	19.30	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00102C

Deuteranopia (green-blind)

#000C2A

Tritanopia (blue-blind)

#001319

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #040b2b;
/* rgb */ color: rgb(4, 11, 43);
/* oklch */ color: oklch(16.8% 0.066 267.2);

Tailwind

colors: {
  custom: {
    50: '#494b64',
    500: '#040b2b',
    950: '#000000',
  },
}

SCSS

$custom: #040b2b;
$custom-light: #494b64;
$custom-dark: #000000;

JSON

{
  "hex": "#040b2b",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 43
  },
  "hsl": {
    "h": 229.231,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.16791,
    "c": 0.06604,
    "h": 267.2
  },
  "luminance": 0.0044
}

Semantic roles & 50–950 ramp

primary

#040B2B

secondary

#6E5F1D

accent

#D52EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040B2B

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

Preview Lab → · Contrast checker → · Palette generator →