#040F37#040F37

#040F37 is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 19.1% C 0.080 H 265.5°. Best body text is #FFFFFF at 18.61:1 contrast (WCAG AA passes).

Color values

HEX	#040F37
RGB	rgb(4, 15, 55)
HSL	hsl(227, 86%, 12%)
HSV	hsv(227, 93%, 22%)
CMYK	cmyk(92.7%, 72.7%, 0%, 78.4%)
CIE-LAB	lab(5.81, 12.17, -27.12)
CIE-LCH	lch(5.81, 29.72, 294.17°)
OKLab	oklab(19.1% -0.0062 -0.0797)
OKLCH	oklch(19.1% 0.08 265.5)
XYZ	xyz(0.9102, 0.6432, 3.6899)
Luminance	0.0064 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 3.09

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F37 #372C04

analogous

#042937 #040F37 #130437

triadic

#040F37 #37040F #0F3704

tetradic

#040F37 #370429 #372C04 #043713

square

#040F37 #370429 #372C04 #043713

split-complementary

#040F37 #371304 #293704

monochromatic

#02081D #02081D #040F37 #081F70 #0C2EA9

Accessibility & contrast

On white

18.61

#040F37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.13

#040F37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F37

18.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F37	#FFFFFF	#000000	##FFFFFF
##040F37	1.00	18.61	1.13	18.61
#FFFFFF	18.61	1.00	21.00	1.00
#000000	1.13	21.00	1.00	21.00
##FFFFFF	18.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001538

Deuteranopia (green-blind)

#001036

Tritanopia (blue-blind)

#001921

Achromatopsia (no color)

#131313

Design tokens & code

CSS

--color: #040f37;
/* rgb */ color: rgb(4, 15, 55);
/* oklch */ color: oklch(19.1% 0.080 265.5);

Tailwind

colors: {
  custom: {
    50: '#4e4d6e',
    500: '#040f37',
    950: '#000000',
  },
}

SCSS

$custom: #040f37;
$custom-light: #4e4d6e;
$custom-dark: #000000;

JSON

{
  "hex": "#040f37",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 55
  },
  "hsl": {
    "h": 227.059,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.19097,
    "c": 0.07991,
    "h": 265.5
  },
  "luminance": 0.00643
}

Semantic roles & 50–950 ramp

primary

#040F37

secondary

#79651E

accent

#CF2BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040F37

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

Preview Lab → · Contrast checker → · Palette generator →