#040B28#040B28

#040B28 is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.5% C 0.061 H 266.8°. Best body text is #FFFFFF at 19.38:1 contrast (WCAG AA passes).

Color values

HEX	#040B28
RGB	rgb(4, 11, 40)
HSL	hsl(228, 82%, 9%)
HSV	hsv(228, 90%, 16%)
CMYK	cmyk(90%, 72.5%, 0%, 84.3%)
CIE-LAB	lab(3.78, 6.35, -19.18)
CIE-LCH	lch(3.78, 20.20, 288.32°)
OKLab	oklab(16.46% -0.0033 -0.0608)
OKLCH	oklch(16.46% 0.061 266.8)
XYZ	xyz(0.5526, 0.4183, 2.0587)
Luminance	0.0042 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.42

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B28 #282104

analogous

#041D28 #040B28 #0F0428

triadic

#040B28 #28040B #0B2804

tetradic

#040B28 #28041D #282104 #04280F

square

#040B28 #28041D #282104 #04280F

split-complementary

#040B28 #280F04 #1D2804

monochromatic

#03081C #03081C #040B28 #0A1A60 #0F2A97

Accessibility & contrast

On white

19.38

#040B28 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.08

#040B28 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B28

19.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B28	#FFFFFF	#000000	##FFFFFF
##040B28	1.00	19.38	1.08	19.38
#FFFFFF	19.38	1.00	21.00	1.00
#000000	1.08	21.00	1.00	21.00
##FFFFFF	19.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#000F29

Deuteranopia (green-blind)

#000C27

Tritanopia (blue-blind)

#001217

Achromatopsia (no color)

#0D0D0D

Design tokens & code

CSS

--color: #040b28;
/* rgb */ color: rgb(4, 11, 40);
/* oklch */ color: oklch(16.5% 0.061 266.8);

Tailwind

colors: {
  custom: {
    50: '#494b62',
    500: '#040b28',
    950: '#000000',
  },
}

SCSS

$custom: #040b28;
$custom-light: #494b62;
$custom-dark: #000000;

JSON

{
  "hex": "#040b28",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 40
  },
  "hsl": {
    "h": 228.333,
    "s": 81.818,
    "l": 8.627
  },
  "oklch": {
    "l": 0.16462,
    "c": 0.06085,
    "h": 266.8
  },
  "luminance": 0.00418
}

Semantic roles & 50–950 ramp

primary

#040B28

secondary

#6B5C1D

accent

#D130F8

background

#F4F4F5

surface

#E7E7EA

border

#C3C3C6

text

#010105

muted

#777779

Preview Lab

Preview with #040B28

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

Preview Lab → · Contrast checker → · Palette generator →