#040B37#040B37

#040B37 is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 18.2% C 0.086 H 267.5°. Best body text is #FFFFFF at 18.95:1 contrast (WCAG AA passes).

Color values

HEX	#040B37
RGB	rgb(4, 11, 55)
HSL	hsl(232, 86%, 12%)
HSV	hsv(232, 93%, 22%)
CMYK	cmyk(92.7%, 80%, 0%, 78.4%)
CIE-LAB	lab(4.89, 14.13, -28.61)
CIE-LCH	lch(4.89, 31.91, 296.28°)
OKLab	oklab(18.21% -0.0038 -0.0855)
OKLCH	oklch(18.21% 0.086 267.5)
XYZ	xyz(0.8591, 0.5409, 3.6728)
Luminance	0.0054 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B37 #373004

analogous

#042537 #040B37 #170437

triadic

#040B37 #37040B #0B3704

tetradic

#040B37 #370425 #373004 #043717

square

#040B37 #370425 #373004 #043717

split-complementary

#040B37 #371704 #253704

monochromatic

#02061D #02061D #040B37 #081670 #0C22A9

Accessibility & contrast

On white

18.95

#040B37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040B37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B37

18.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B37	#FFFFFF	#000000	##FFFFFF
##040B37	1.00	18.95	1.11	18.95
#FFFFFF	18.95	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001338

Deuteranopia (green-blind)

#000E36

Tritanopia (blue-blind)

#00171F

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040b37;
/* rgb */ color: rgb(4, 11, 55);
/* oklch */ color: oklch(18.2% 0.086 267.5);

Tailwind

colors: {
  custom: {
    50: '#4d4b6e',
    500: '#040b37',
    950: '#000000',
  },
}

SCSS

$custom: #040b37;
$custom-light: #4d4b6e;
$custom-dark: #000000;

JSON

{
  "hex": "#040b37",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 55
  },
  "hsl": {
    "h": 231.765,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.18208,
    "c": 0.0856,
    "h": 267.5
  },
  "luminance": 0.00541
}

Semantic roles & 50–950 ramp

primary

#040B37

secondary

#796D1E

accent

#E02BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040B37

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

Preview Lab → · Contrast checker → · Palette generator →