#040A2A#040A2A

#040A2A is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.4% C 0.066 H 267.9°. Best body text is #FFFFFF at 19.41:1 contrast (WCAG AA passes).

Color values

HEX	#040A2A
RGB	rgb(4, 10, 42)
HSL	hsl(231, 83%, 9%)
HSV	hsv(231, 90%, 16%)
CMYK	cmyk(90.5%, 76.2%, 0%, 83.5%)
CIE-LAB	lab(3.70, 7.65, -20.82)
CIE-LCH	lch(3.70, 22.18, 290.17°)
OKLab	oklab(16.43% -0.0024 -0.0658)
OKLCH	oklch(16.43% 0.066 267.9)
XYZ	xyz(0.5764, 0.4100, 2.2388)
Luminance	0.0041 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.46

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A2A #2A2404

analogous

#041D2A #040A2A #11042A

triadic

#040A2A #2A040A #0A2A04

tetradic

#040A2A #2A041D #2A2404 #042A11

square

#040A2A #2A041D #2A2404 #042A11

split-complementary

#040A2A #2A1104 #1D2A04

monochromatic

#03071C #03071C #040A2A #091762 #0F259A

Accessibility & contrast

On white

19.41

#040A2A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.08

#040A2A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A2A

19.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A2A	#FFFFFF	#000000	##FFFFFF
##040A2A	1.00	19.41	1.08	19.41
#FFFFFF	19.41	1.00	21.00	1.00
#000000	1.08	21.00	1.00	21.00
##FFFFFF	19.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#000F2B

Deuteranopia (green-blind)

#000B29

Tritanopia (blue-blind)

#001218

Achromatopsia (no color)

#0D0D0D

Design tokens & code

CSS

--color: #040a2a;
/* rgb */ color: rgb(4, 10, 42);
/* oklch */ color: oklch(16.4% 0.066 267.9);

Tailwind

colors: {
  custom: {
    50: '#494b63',
    500: '#040a2a',
    950: '#000000',
  },
}

SCSS

$custom: #040a2a;
$custom-light: #494b63;
$custom-dark: #000000;

JSON

{
  "hex": "#040a2a",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 42
  },
  "hsl": {
    "h": 230.526,
    "s": 82.609,
    "l": 9.02
  },
  "oklch": {
    "l": 0.16434,
    "c": 0.06588,
    "h": 267.9
  },
  "luminance": 0.0041
}

Semantic roles & 50–950 ramp

primary

#040A2A

secondary

#6D601D

accent

#D92FF9

background

#F4F4F5

surface

#E7E7EA

border

#C3C3C6

text

#010105

muted

#777779

Preview Lab

Preview with #040A2A

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

Preview Lab → · Contrast checker → · Palette generator →