#040F39#040F39

#040F39 is a very dark, moderate blue. Relative luminance 0.007; OKLCH L 19.3% C 0.083 H 265.7°. Best body text is #FFFFFF at 18.54:1 contrast (WCAG AA passes).

Color values

HEX	#040F39
RGB	rgb(4, 15, 57)
HSL	hsl(228, 87%, 12%)
HSV	hsv(228, 93%, 22%)
CMYK	cmyk(93%, 73.7%, 0%, 77.6%)
CIE-LAB	lab(5.99, 13.28, -28.29)
CIE-LCH	lch(5.99, 31.25, 295.15°)
OKLab	oklab(19.32% -0.0062 -0.0829)
OKLCH	oklch(19.32% 0.083 265.7)
XYZ	xyz(0.9592, 0.6628, 3.9475)
Luminance	0.0066 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 2.75

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F39 #392E04

analogous

#042A39 #040F39 #140439

triadic

#040F39 #39040F #0F3904

tetradic

#040F39 #39042A #392E04 #043914

square

#040F39 #39042A #392E04 #043914

split-complementary

#040F39 #391404 #2A3904

monochromatic

#02081D #02081D #040F39 #081E72 #0C2DAB

Accessibility & contrast

On white

18.54

#040F39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.13

#040F39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F39

18.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F39	#FFFFFF	#000000	##FFFFFF
##040F39	1.00	18.54	1.13	18.54
#FFFFFF	18.54	1.00	21.00	1.00
#000000	1.13	21.00	1.00	21.00
##FFFFFF	18.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00163A

Deuteranopia (green-blind)

#001138

Tritanopia (blue-blind)

#001A22

Achromatopsia (no color)

#131313

Design tokens & code

CSS

--color: #040f39;
/* rgb */ color: rgb(4, 15, 57);
/* oklch */ color: oklch(19.3% 0.083 265.7);

Tailwind

colors: {
  custom: {
    50: '#4e4d70',
    500: '#040f39',
    950: '#000000',
  },
}

SCSS

$custom: #040f39;
$custom-light: #4e4d70;
$custom-dark: #000000;

JSON

{
  "hex": "#040f39",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 57
  },
  "hsl": {
    "h": 227.547,
    "s": 86.885,
    "l": 11.961
  },
  "oklch": {
    "l": 0.19324,
    "c": 0.08312,
    "h": 265.7
  },
  "luminance": 0.00663
}

Semantic roles & 50–950 ramp

primary

#040F39

secondary

#7B681E

accent

#D12BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040F39

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

Preview Lab → · Contrast checker → · Palette generator →