#040B39#040B39

#040B39 is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.5% C 0.089 H 267.4°. Best body text is #FFFFFF at 18.88:1 contrast (WCAG AA passes).

Color values

HEX	#040B39
RGB	rgb(4, 11, 57)
HSL	hsl(232, 87%, 12%)
HSV	hsv(232, 93%, 22%)
CMYK	cmyk(93%, 80.7%, 0%, 77.6%)
CIE-LAB	lab(5.06, 15.30, -29.78)
CIE-LCH	lch(5.06, 33.48, 297.20°)
OKLab	oklab(18.46% -0.004 -0.0886)
OKLCH	oklch(18.46% 0.089 267.4)
XYZ	xyz(0.9080, 0.5605, 3.9304)
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

#040B39 #393204

analogous

#042639 #040B39 #180439

triadic

#040B39 #39040B #0B3904

tetradic

#040B39 #390426 #393204 #043918

square

#040B39 #390426 #393204 #043918

split-complementary

#040B39 #391804 #263904

monochromatic

#02061D #02061D #040B39 #081672 #0C21AB

Accessibility & contrast

On white

18.88

#040B39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040B39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B39

18.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B39	#FFFFFF	#000000	##FFFFFF
##040B39	1.00	18.88	1.11	18.88
#FFFFFF	18.88	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00143A

Deuteranopia (green-blind)

#000E38

Tritanopia (blue-blind)

#001820

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040b39;
/* rgb */ color: rgb(4, 11, 57);
/* oklch */ color: oklch(18.5% 0.089 267.4);

Tailwind

colors: {
  custom: {
    50: '#4e4b70',
    500: '#040b39',
    950: '#000000',
  },
}

SCSS

$custom: #040b39;
$custom-light: #4e4b70;
$custom-dark: #000000;

JSON

{
  "hex": "#040b39",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 57
  },
  "hsl": {
    "h": 232.075,
    "s": 86.885,
    "l": 11.961
  },
  "oklch": {
    "l": 0.18457,
    "c": 0.08869,
    "h": 267.4
  },
  "luminance": 0.00561
}

Semantic roles & 50–950 ramp

primary

#040B39

secondary

#7B6F1E

accent

#E12BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040B39

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

Preview Lab → · Contrast checker → · Palette generator →