#040C2A#040C2A

#040C2A is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 16.9% C 0.063 H 266.2°. Best body text is #FFFFFF at 19.24:1 contrast (WCAG AA passes).

Color values

HEX	#040C2A
RGB	rgb(4, 12, 42)
HSL	hsl(227, 83%, 9%)
HSV	hsv(227, 90%, 16%)
CMYK	cmyk(90.5%, 71.4%, 0%, 83.5%)
CIE-LAB	lab(4.12, 6.80, -20.17)
CIE-LCH	lch(4.12, 21.28, 288.63°)
OKLab	oklab(16.93% -0.0042 -0.0626)
OKLCH	oklch(16.93% 0.063 266.2)
XYZ	xyz(0.5993, 0.4559, 2.2464)
Luminance	0.0046 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.96

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040C2A #2A2204

analogous

#041F2A #040C2A #0F042A

triadic

#040C2A #2A040C #0C2A04

tetradic

#040C2A #2A041F #2A2204 #042A0F

square

#040C2A #2A041F #2A2204 #042A0F

split-complementary

#040C2A #2A0F04 #1F2A04

monochromatic

#03081C #03081C #040C2A #091C62 #0F2C9A

Accessibility & contrast

On white

19.24

#040C2A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040C2A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040C2A

19.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040C2A	#FFFFFF	#000000	##FFFFFF
##040C2A	1.00	19.24	1.09	19.24
#FFFFFF	19.24	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00102B

Deuteranopia (green-blind)

#000D29

Tritanopia (blue-blind)

#001319

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #040c2a;
/* rgb */ color: rgb(4, 12, 42);
/* oklch */ color: oklch(16.9% 0.063 266.2);

Tailwind

colors: {
  custom: {
    50: '#494c63',
    500: '#040c2a',
    950: '#000000',
  },
}

SCSS

$custom: #040c2a;
$custom-light: #494c63;
$custom-dark: #000000;

JSON

{
  "hex": "#040c2a",
  "rgb": {
    "r": 4,
    "g": 12,
    "b": 42
  },
  "hsl": {
    "h": 227.368,
    "s": 82.609,
    "l": 9.02
  },
  "oklch": {
    "l": 0.16932,
    "c": 0.06275,
    "h": 266.2
  },
  "luminance": 0.00456
}

Semantic roles & 50–950 ramp

primary

#040C2A

secondary

#6D5C1D

accent

#CE2FF9

background

#F4F4F5

surface

#E7E7EA

border

#C3C3C6

text

#010105

muted

#777779

Preview Lab

Preview with #040C2A

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

Preview Lab → · Contrast checker → · Palette generator →