#040F2E#040F2E

#040F2E is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.1% C 0.065 H 264.2°. Best body text is #FFFFFF at 18.87:1 contrast (WCAG AA passes).

Color values

HEX	#040F2E
RGB	rgb(4, 15, 46)
HSL	hsl(224, 84%, 10%)
HSV	hsv(224, 91%, 18%)
CMYK	cmyk(91.3%, 67.4%, 0%, 82%)
CIE-LAB	lab(5.10, 7.26, -21.62)
CIE-LCH	lch(5.10, 22.81, 288.56°)
OKLab	oklab(18.13% -0.0066 -0.0646)
OKLCH	oklch(18.13% 0.065 264.2)
XYZ	xyz(0.7139, 0.5646, 2.6556)
Luminance	0.0056 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.51

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F2E #2E2304

analogous

#04242E #040F2E #0E042E

triadic

#040F2E #2E040F #0F2E04

tetradic

#040F2E #2E0424 #2E2304 #042E0E

square

#040F2E #2E0424 #2E2304 #042E0E

split-complementary

#040F2E #2E0E04 #242E04

monochromatic

#02091C #02091C #040F2E #092166 #0E349F

Accessibility & contrast

On white

18.87

#040F2E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040F2E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F2E

18.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F2E	#FFFFFF	#000000	##FFFFFF
##040F2E	1.00	18.87	1.11	18.87
#FFFFFF	18.87	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00132F

Deuteranopia (green-blind)

#000F2D

Tritanopia (blue-blind)

#00171C

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040f2e;
/* rgb */ color: rgb(4, 15, 46);
/* oklch */ color: oklch(18.1% 0.065 264.2);

Tailwind

colors: {
  custom: {
    50: '#4a4d67',
    500: '#040f2e',
    950: '#000000',
  },
}

SCSS

$custom: #040f2e;
$custom-light: #4a4d67;
$custom-dark: #000000;

JSON

{
  "hex": "#040f2e",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 46
  },
  "hsl": {
    "h": 224.286,
    "s": 84,
    "l": 9.804
  },
  "oklch": {
    "l": 0.18126,
    "c": 0.06493,
    "h": 264.2
  },
  "luminance": 0.00565
}

Semantic roles & 50–950 ramp

primary

#040F2E

secondary

#715B1D

accent

#C52EFA

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040F2E

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

Preview Lab → · Contrast checker → · Palette generator →