#040F3A#040F3A

#040F3A is a very dark, moderate blue. Relative luminance 0.007; OKLCH L 19.4% C 0.085 H 265.8°. Best body text is #FFFFFF at 18.51:1 contrast (WCAG AA passes).

Color values

HEX	#040F3A
RGB	rgb(4, 15, 58)
HSL	hsl(228, 87%, 12%)
HSV	hsv(228, 93%, 23%)
CMYK	cmyk(93.1%, 74.1%, 0%, 77.3%)
CIE-LAB	lab(6.08, 13.82, -28.86)
CIE-LCH	lch(6.08, 32.00, 295.59°)
OKLab	oklab(19.44% -0.0062 -0.0845)
OKLCH	oklch(19.44% 0.085 265.8)
XYZ	xyz(0.9843, 0.6728, 4.0802)
Luminance	0.0067 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F3A #3A2F04

analogous

#042A3A #040F3A #14043A

triadic

#040F3A #3A040F #0F3A04

tetradic

#040F3A #3A042A #3A2F04 #043A14

square

#040F3A #3A042A #3A2F04 #043A14

split-complementary

#040F3A #3A1404 #2A3A04

monochromatic

#02071D #02071D #040F3A #081E73 #0C2DAD

Accessibility & contrast

On white

18.51

#040F3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.13

#040F3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F3A

18.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F3A	#FFFFFF	#000000	##FFFFFF
##040F3A	1.00	18.51	1.13	18.51
#FFFFFF	18.51	1.00	21.00	1.00
#000000	1.13	21.00	1.00	21.00
##FFFFFF	18.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00163B

Deuteranopia (green-blind)

#001139

Tritanopia (blue-blind)

#001A22

Achromatopsia (no color)

#131313

Design tokens & code

CSS

--color: #040f3a;
/* rgb */ color: rgb(4, 15, 58);
/* oklch */ color: oklch(19.4% 0.085 265.8);

Tailwind

colors: {
  custom: {
    50: '#4f4d71',
    500: '#040f3a',
    950: '#000000',
  },
}

SCSS

$custom: #040f3a;
$custom-light: #4f4d71;
$custom-dark: #000000;

JSON

{
  "hex": "#040f3a",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 58
  },
  "hsl": {
    "h": 227.778,
    "s": 87.097,
    "l": 12.157
  },
  "oklch": {
    "l": 0.19439,
    "c": 0.08471,
    "h": 265.8
  },
  "luminance": 0.00673
}

Semantic roles & 50–950 ramp

primary

#040F3A

secondary

#7C691E

accent

#D22BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040F3A

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

Preview Lab → · Contrast checker → · Palette generator →