#040D37#040D37

#040D37 is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.6% C 0.083 H 266.6°. Best body text is #FFFFFF at 18.79:1 contrast (WCAG AA passes).

Color values

HEX	#040D37
RGB	rgb(4, 13, 55)
HSL	hsl(229, 86%, 12%)
HSV	hsv(229, 93%, 22%)
CMYK	cmyk(92.7%, 76.4%, 0%, 78.4%)
CIE-LAB	lab(5.32, 13.21, -27.90)
CIE-LCH	lch(5.32, 30.87, 295.33°)
OKLab	oklab(18.64% -0.0049 -0.0827)
OKLCH	oklch(18.64% 0.083 266.6)
XYZ	xyz(0.8833, 0.5894, 3.6809)
Luminance	0.0059 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 2.50

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040D37 #372E04

analogous

#042737 #040D37 #150437

triadic

#040D37 #37040D #0D3704

tetradic

#040D37 #370427 #372E04 #043715

square

#040D37 #370427 #372E04 #043715

split-complementary

#040D37 #371504 #273704

monochromatic

#02071D #02071D #040D37 #081A70 #0C28A9

Accessibility & contrast

On white

18.79

#040D37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040D37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040D37

18.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040D37	#FFFFFF	#000000	##FFFFFF
##040D37	1.00	18.79	1.12	18.79
#FFFFFF	18.79	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001438

Deuteranopia (green-blind)

#000F36

Tritanopia (blue-blind)

#001820

Achromatopsia (no color)

#121212

Design tokens & code

CSS

--color: #040d37;
/* rgb */ color: rgb(4, 13, 55);
/* oklch */ color: oklch(18.6% 0.083 266.6);

Tailwind

colors: {
  custom: {
    50: '#4d4c6e',
    500: '#040d37',
    950: '#000000',
  },
}

SCSS

$custom: #040d37;
$custom-light: #4d4c6e;
$custom-dark: #000000;

JSON

{
  "hex": "#040d37",
  "rgb": {
    "r": 4,
    "g": 13,
    "b": 55
  },
  "hsl": {
    "h": 229.412,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.1864,
    "c": 0.08281,
    "h": 266.6
  },
  "luminance": 0.00589
}

Semantic roles & 50–950 ramp

primary

#040D37

secondary

#79691E

accent

#D82BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040D37

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

Preview Lab → · Contrast checker → · Palette generator →