#040E2B#040E2B

#040E2B is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.6% C 0.061 H 264.4°. Best body text is #FFFFFF at 19.04:1 contrast (WCAG AA passes).

Color values

HEX	#040E2B
RGB	rgb(4, 14, 43)
HSL	hsl(225, 83%, 9%)
HSV	hsv(225, 91%, 17%)
CMYK	cmyk(90.7%, 67.4%, 0%, 83.1%)
CIE-LAB	lab(4.64, 6.32, -20.09)
CIE-LCH	lch(4.64, 21.06, 287.46°)
OKLab	oklab(17.56% -0.006 -0.061)
OKLCH	oklch(17.56% 0.061 264.4)
XYZ	xyz(0.6430, 0.5142, 2.3504)
Luminance	0.0051 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.18

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040E2B #2B2104

analogous

#04222B #040E2B #0E042B

triadic

#040E2B #2B040E #0E2B04

tetradic

#040E2B #2B0422 #2B2104 #042B0E

square

#040E2B #2B0422 #2B2104 #042B0E

split-complementary

#040E2B #2B0E04 #222B04

monochromatic

#03091C #03091C #040E2B #092063 #0E329B

Accessibility & contrast

On white

19.04

#040E2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040E2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040E2B

19.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040E2B	#FFFFFF	#000000	##FFFFFF
##040E2B	1.00	19.04	1.10	19.04
#FFFFFF	19.04	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00122C

Deuteranopia (green-blind)

#000E2A

Tritanopia (blue-blind)

#00151A

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040e2b;
/* rgb */ color: rgb(4, 14, 43);
/* oklch */ color: oklch(17.6% 0.061 264.4);

Tailwind

colors: {
  custom: {
    50: '#494d64',
    500: '#040e2b',
    950: '#000000',
  },
}

SCSS

$custom: #040e2b;
$custom-light: #494d64;
$custom-dark: #000000;

JSON

{
  "hex": "#040e2b",
  "rgb": {
    "r": 4,
    "g": 14,
    "b": 43
  },
  "hsl": {
    "h": 224.615,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.17557,
    "c": 0.06131,
    "h": 264.4
  },
  "luminance": 0.00514
}

Semantic roles & 50–950 ramp

primary

#040E2B

secondary

#6E591D

accent

#C52EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040E2B

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

Preview Lab → · Contrast checker → · Palette generator →