#040B3A#040B3A

#040B3A is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.6% C 0.090 H 267.4°. Best body text is #FFFFFF at 18.85:1 contrast (WCAG AA passes).

Color values

HEX	#040B3A
RGB	rgb(4, 11, 58)
HSL	hsl(232, 87%, 12%)
HSV	hsv(232, 93%, 23%)
CMYK	cmyk(93.1%, 81%, 0%, 77.3%)
CIE-LAB	lab(5.15, 15.89, -30.36)
CIE-LCH	lch(5.15, 34.27, 297.62°)
OKLab	oklab(18.58% -0.0041 -0.0901)
OKLCH	oklch(18.58% 0.09 267.4)
XYZ	xyz(0.9332, 0.5705, 4.0631)
Luminance	0.0057 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Dark Navy

#000435

ΔE00 1.40

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B3A #3A3304

analogous

#04263A #040B3A #18043A

triadic

#040B3A #3A040B #0B3A04

tetradic

#040B3A #3A0426 #3A3304 #043A18

square

#040B3A #3A0426 #3A3304 #043A18

split-complementary

#040B3A #3A1804 #263A04

monochromatic

#02051D #02051D #040B3A #081673 #0C21AD

Accessibility & contrast

On white

18.85

#040B3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040B3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B3A

18.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B3A	#FFFFFF	#000000	##FFFFFF
##040B3A	1.00	18.85	1.11	18.85
#FFFFFF	18.85	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00143B

Deuteranopia (green-blind)

#000F39

Tritanopia (blue-blind)

#001821

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040b3a;
/* rgb */ color: rgb(4, 11, 58);
/* oklch */ color: oklch(18.6% 0.090 267.4);

Tailwind

colors: {
  custom: {
    50: '#4f4b71',
    500: '#040b3a',
    950: '#000000',
  },
}

SCSS

$custom: #040b3a;
$custom-light: #4f4b71;
$custom-dark: #000000;

JSON

{
  "hex": "#040b3a",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 58
  },
  "hsl": {
    "h": 232.222,
    "s": 87.097,
    "l": 12.157
  },
  "oklch": {
    "l": 0.18583,
    "c": 0.09022,
    "h": 267.4
  },
  "luminance": 0.00571
}

Semantic roles & 50–950 ramp

primary

#040B3A

secondary

#7C701E

accent

#E22BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040B3A

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

Preview Lab → · Contrast checker → · Palette generator →