#040F2F#040F2F

#040F2F is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.2% C 0.067 H 264.4°. Best body text is #FFFFFF at 18.84:1 contrast (WCAG AA passes).

Color values

HEX	#040F2F
RGB	rgb(4, 15, 47)
HSL	hsl(225, 84%, 10%)
HSV	hsv(225, 91%, 18%)
CMYK	cmyk(91.5%, 68.1%, 0%, 81.6%)
CIE-LAB	lab(5.17, 7.77, -22.25)
CIE-LCH	lch(5.17, 23.57, 289.24°)
OKLab	oklab(18.23% -0.0065 -0.0663)
OKLCH	oklch(18.23% 0.067 264.4)
XYZ	xyz(0.7338, 0.5726, 2.7606)
Luminance	0.0057 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.20

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2F #2F2404

analogous

#04252F #040F2F #0E042F

triadic

#040F2F #2F040F #0F2F04

tetradic

#040F2F #2F0425 #2F2404 #042F0E

square

#040F2F #2F0425 #2F2404 #042F0E

split-complementary

#040F2F #2F0E04 #252F04

monochromatic

#02091C #02091C #040F2F #092167 #0E33A0

Accessibility & contrast

On white

18.84

#040F2F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2F

18.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2F	#FFFFFF	#000000	##FFFFFF
##040F2F	1.00	18.84	1.11	18.84
#FFFFFF	18.84	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001330

Deuteranopia (green-blind)

#000F2E

Tritanopia (blue-blind)

#00171D

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040f2f;
/* rgb */ color: rgb(4, 15, 47);
/* oklch */ color: oklch(18.2% 0.067 264.4);

Tailwind

colors: {
  custom: {
    50: '#4b4d68',
    500: '#040f2f',
    950: '#000000',
  },
}

SCSS

$custom: #040f2f;
$custom-light: #4b4d68;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2f",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 47
  },
  "hsl": {
    "h": 224.651,
    "s": 84.314,
    "l": 10
  },
  "oklch": {
    "l": 0.18229,
    "c": 0.06663,
    "h": 264.4
  },
  "luminance": 0.00573
}

Semantic roles & 50–950 ramp

primary

#040F2F

secondary

#725C1D

accent

#C62DFB

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040F2F

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

Preview Lab → · Contrast checker → · Palette generator →