#040B2A#040B2A

#040B2A is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.7% C 0.064 H 267.1°. Best body text is #FFFFFF at 19.33:1 contrast (WCAG AA passes).

Color values

HEX	#040B2A
RGB	rgb(4, 11, 42)
HSL	hsl(229, 83%, 9%)
HSV	hsv(229, 90%, 16%)
CMYK	cmyk(90.5%, 73.8%, 0%, 83.5%)
CIE-LAB	lab(3.90, 7.23, -20.50)
CIE-LCH	lch(3.90, 21.74, 289.44°)
OKLab	oklab(16.68% -0.0033 -0.0642)
OKLCH	oklch(16.68% 0.064 267.1)
XYZ	xyz(0.5875, 0.4323, 2.2425)
Luminance	0.0043 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.70

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B2A #2A2304

analogous

#041E2A #040B2A #10042A

triadic

#040B2A #2A040B #0B2A04

tetradic

#040B2A #2A041E #2A2304 #042A10

square

#040B2A #2A041E #2A2304 #042A10

split-complementary

#040B2A #2A1004 #1E2A04

monochromatic

#03071C #03071C #040B2A #091A62 #0F289A

Accessibility & contrast

On white

19.33

#040B2A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040B2A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B2A

19.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B2A	#FFFFFF	#000000	##FFFFFF
##040B2A	1.00	19.33	1.09	19.33
#FFFFFF	19.33	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00102B

Deuteranopia (green-blind)

#000C29

Tritanopia (blue-blind)

#001318

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #040b2a;
/* rgb */ color: rgb(4, 11, 42);
/* oklch */ color: oklch(16.7% 0.064 267.1);

Tailwind

colors: {
  custom: {
    50: '#494b63',
    500: '#040b2a',
    950: '#000000',
  },
}

SCSS

$custom: #040b2a;
$custom-light: #494b63;
$custom-dark: #000000;

JSON

{
  "hex": "#040b2a",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 42
  },
  "hsl": {
    "h": 228.947,
    "s": 82.609,
    "l": 9.02
  },
  "oklch": {
    "l": 0.1668,
    "c": 0.06432,
    "h": 267.1
  },
  "luminance": 0.00432
}

Semantic roles & 50–950 ramp

primary

#040B2A

secondary

#6D5E1D

accent

#D42FF9

background

#F4F4F5

surface

#E7E7EA

border

#C3C3C6

text

#010105

muted

#777779

Preview Lab

Preview with #040B2A

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

Preview Lab → · Contrast checker → · Palette generator →