#040F2D#040F2D

#040F2D is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.0% C 0.063 H 263.9°. Best body text is #FFFFFF at 18.90:1 contrast (WCAG AA passes).

Color values

HEX	#040F2D
RGB	rgb(4, 15, 45)
HSL	hsl(224, 84%, 10%)
HSV	hsv(224, 91%, 18%)
CMYK	cmyk(91.1%, 66.7%, 0%, 82.4%)
CIE-LAB	lab(5.03, 6.77, -20.99)
CIE-LCH	lch(5.03, 22.05, 287.87°)
OKLab	oklab(18.02% -0.0067 -0.0628)
OKLCH	oklch(18.02% 0.063 263.9)
XYZ	xyz(0.6944, 0.5568, 2.5530)
Luminance	0.0056 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.83

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2D #2D2204

analogous

#04242D #040F2D #0D042D

triadic

#040F2D #2D040F #0F2D04

tetradic

#040F2D #2D0424 #2D2204 #042D0D

square

#040F2D #2D0424 #2D2204 #042D0D

split-complementary

#040F2D #2D0D04 #242D04

monochromatic

#02091C #02091C #040F2D #092265 #0E349D

Accessibility & contrast

On white

18.90

#040F2D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2D

18.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2D	#FFFFFF	#000000	##FFFFFF
##040F2D	1.00	18.90	1.11	18.90
#FFFFFF	18.90	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00132E

Deuteranopia (green-blind)

#000F2C

Tritanopia (blue-blind)

#00161B

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040f2d;
/* rgb */ color: rgb(4, 15, 45);
/* oklch */ color: oklch(18.0% 0.063 263.9);

Tailwind

colors: {
  custom: {
    50: '#4a4d66',
    500: '#040f2d',
    950: '#000000',
  },
}

SCSS

$custom: #040f2d;
$custom-light: #4a4d66;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2d",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 45
  },
  "hsl": {
    "h": 223.902,
    "s": 83.673,
    "l": 9.608
  },
  "oklch": {
    "l": 0.18024,
    "c": 0.0632,
    "h": 263.9
  },
  "luminance": 0.00557
}

Semantic roles & 50–950 ramp

primary

#040F2D

secondary

#705A1D

accent

#C32EFA

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040F2D

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

Preview Lab → · Contrast checker → · Palette generator →