#040A3B#040A3B

#040A3B is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.5% C 0.093 H 267.7°. Best body text is #FFFFFF at 18.89:1 contrast (WCAG AA passes).

Color values

HEX	#040A3B
RGB	rgb(4, 10, 59)
HSL	hsl(233, 87%, 12%)
HSV	hsv(233, 93%, 23%)
CMYK	cmyk(93.2%, 83.1%, 0%, 76.9%)
CIE-LAB	lab(5.04, 16.91, -31.26)
CIE-LCH	lch(5.04, 35.54, 298.41°)
OKLab	oklab(18.52% -0.0038 -0.0929)
OKLCH	oklch(18.52% 0.093 267.7)
XYZ	xyz(0.9478, 0.5585, 4.1947)
Luminance	0.0056 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A3B #3B3504

analogous

#04253B #040A3B #1A043B

triadic

#040A3B #3B040A #0A3B04

tetradic

#040A3B #3B0425 #3B3504 #043B1A

square

#040A3B #3B0425 #3B3504 #043B1A

split-complementary

#040A3B #3B1A04 #253B04

monochromatic

#02051D #02051D #040A3B #081474 #0C1DAE

Accessibility & contrast

On white

18.89

#040A3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040A3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A3B

18.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A3B	#FFFFFF	#000000	##FFFFFF
##040A3B	1.00	18.89	1.11	18.89
#FFFFFF	18.89	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00143C

Deuteranopia (green-blind)

#000E3A

Tritanopia (blue-blind)

#001821

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040a3b;
/* rgb */ color: rgb(4, 10, 59);
/* oklch */ color: oklch(18.5% 0.093 267.7);

Tailwind

colors: {
  custom: {
    50: '#4f4a71',
    500: '#040a3b',
    950: '#000000',
  },
}

SCSS

$custom: #040a3b;
$custom-light: #4f4a71;
$custom-dark: #000000;

JSON

{
  "hex": "#040a3b",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 59
  },
  "hsl": {
    "h": 233.455,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.18515,
    "c": 0.09301,
    "h": 267.7
  },
  "luminance": 0.00559
}

Semantic roles & 50–950 ramp

primary

#040A3B

secondary

#7D721E

accent

#E62AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020108

muted

#78777B

Preview Lab

Preview with #040A3B

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

Preview Lab → · Contrast checker → · Palette generator →