#040A37#040A37

#040A37 is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 18.0% C 0.087 H 267.8°. Best body text is #FFFFFF at 19.03:1 contrast (WCAG AA passes).

Color values

HEX	#040A37
RGB	rgb(4, 10, 55)
HSL	hsl(233, 86%, 12%)
HSV	hsv(233, 93%, 22%)
CMYK	cmyk(92.7%, 81.8%, 0%, 78.4%)
CIE-LAB	lab(4.68, 14.55, -28.94)
CIE-LCH	lch(4.68, 32.39, 296.69°)
OKLab	oklab(18% -0.0033 -0.0869)
OKLCH	oklch(18% 0.087 267.8)
XYZ	xyz(0.8480, 0.5186, 3.6691)
Luminance	0.0052 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A37 #373104

analogous

#042437 #040A37 #180437

triadic

#040A37 #37040A #0A3704

tetradic

#040A37 #370424 #373104 #043718

square

#040A37 #370424 #373104 #043718

split-complementary

#040A37 #371804 #243704

monochromatic

#02051D #02051D #040A37 #081470 #0C1FA9

Accessibility & contrast

On white

19.03

#040A37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040A37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A37

19.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A37	#FFFFFF	#000000	##FFFFFF
##040A37	1.00	19.03	1.10	19.03
#FFFFFF	19.03	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001338

Deuteranopia (green-blind)

#000D36

Tritanopia (blue-blind)

#00171F

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040a37;
/* rgb */ color: rgb(4, 10, 55);
/* oklch */ color: oklch(18.0% 0.087 267.8);

Tailwind

colors: {
  custom: {
    50: '#4d4a6e',
    500: '#040a37',
    950: '#000000',
  },
}

SCSS

$custom: #040a37;
$custom-light: #4d4a6e;
$custom-dark: #000000;

JSON

{
  "hex": "#040a37",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 55
  },
  "hsl": {
    "h": 232.941,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.18002,
    "c": 0.08694,
    "h": 267.8
  },
  "luminance": 0.00519
}

Semantic roles & 50–950 ramp

primary

#040A37

secondary

#796E1E

accent

#E42BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040A37

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

Preview Lab → · Contrast checker → · Palette generator →