#040F2C#040F2C

#040F2C is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.9% C 0.061 H 263.6°. Best body text is #FFFFFF at 18.92:1 contrast (WCAG AA passes).

Color values

HEX	#040F2C
RGB	rgb(4, 15, 44)
HSL	hsl(224, 83%, 9%)
HSV	hsv(224, 91%, 17%)
CMYK	cmyk(90.9%, 65.9%, 0%, 82.7%)
CIE-LAB	lab(4.96, 6.28, -20.35)
CIE-LCH	lch(4.96, 21.29, 287.16°)
OKLab	oklab(17.92% -0.0068 -0.0611)
OKLCH	oklch(17.92% 0.061 263.6)
XYZ	xyz(0.6754, 0.5492, 2.4528)
Luminance	0.0055 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.16

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2C #2C2104

analogous

#04232C #040F2C #0D042C

triadic

#040F2C #2C040F #0F2C04

tetradic

#040F2C #2C0423 #2C2104 #042C0D

square

#040F2C #2C0423 #2C2104 #042C0D

split-complementary

#040F2C #2C0D04 #232C04

monochromatic

#030A1C #030A1C #040F2C #092264 #0E359C

Accessibility & contrast

On white

18.92

#040F2C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2C

18.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2C	#FFFFFF	#000000	##FFFFFF
##040F2C	1.00	18.92	1.11	18.92
#FFFFFF	18.92	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00132D

Deuteranopia (green-blind)

#000F2B

Tritanopia (blue-blind)

#00161B

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040f2c;
/* rgb */ color: rgb(4, 15, 44);
/* oklch */ color: oklch(17.9% 0.061 263.6);

Tailwind

colors: {
  custom: {
    50: '#4a4d65',
    500: '#040f2c',
    950: '#000000',
  },
}

SCSS

$custom: #040f2c;
$custom-light: #4a4d65;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2c",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 44
  },
  "hsl": {
    "h": 223.5,
    "s": 83.333,
    "l": 9.412
  },
  "oklch": {
    "l": 0.17923,
    "c": 0.06147,
    "h": 263.6
  },
  "luminance": 0.00549
}

Semantic roles & 50–950 ramp

primary

#040F2C

secondary

#6F581D

accent

#C22EFA

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040F2C

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

Preview Lab → · Contrast checker → · Palette generator →