#040A39#040A39

#040A39 is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 18.3% C 0.090 H 267.8°. Best body text is #FFFFFF at 18.96:1 contrast (WCAG AA passes).

Color values

HEX	#040A39
RGB	rgb(4, 10, 57)
HSL	hsl(233, 87%, 12%)
HSV	hsv(233, 93%, 22%)
CMYK	cmyk(93%, 82.5%, 0%, 77.6%)
CIE-LAB	lab(4.86, 15.74, -30.11)
CIE-LCH	lch(4.86, 33.97, 297.60°)
OKLab	oklab(18.26% -0.0035 -0.0899)
OKLCH	oklch(18.26% 0.09 267.8)
XYZ	xyz(0.8969, 0.5382, 3.9267)
Luminance	0.0054 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Dark Navy

#000435

ΔE00 1.24

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A39 #393304

analogous

#042539 #040A39 #190439

triadic

#040A39 #39040A #0A3904

tetradic

#040A39 #390425 #393304 #043919

square

#040A39 #390425 #393304 #043919

split-complementary

#040A39 #391904 #253904

monochromatic

#02051D #02051D #040A39 #081472 #0C1EAB

Accessibility & contrast

On white

18.96

#040A39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040A39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A39

18.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A39	#FFFFFF	#000000	##FFFFFF
##040A39	1.00	18.96	1.11	18.96
#FFFFFF	18.96	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00133A

Deuteranopia (green-blind)

#000E38

Tritanopia (blue-blind)

#001720

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040a39;
/* rgb */ color: rgb(4, 10, 57);
/* oklch */ color: oklch(18.3% 0.090 267.8);

Tailwind

colors: {
  custom: {
    50: '#4e4a70',
    500: '#040a39',
    950: '#000000',
  },
}

SCSS

$custom: #040a39;
$custom-light: #4e4a70;
$custom-dark: #000000;

JSON

{
  "hex": "#040a39",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 57
  },
  "hsl": {
    "h": 233.208,
    "s": 86.885,
    "l": 11.961
  },
  "oklch": {
    "l": 0.18257,
    "c": 0.09,
    "h": 267.8
  },
  "luminance": 0.00538
}

Semantic roles & 50–950 ramp

primary

#040A39

secondary

#7B701E

accent

#E52BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040A39

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

Preview Lab → · Contrast checker → · Palette generator →