#040B23#040B23

#040B23 is a very dark, muted blue. Relative luminance 0.004; OKLCH L 15.9% C 0.052 H 265.8°. Best body text is #FFFFFF at 19.49:1 contrast (WCAG AA passes).

Color values

HEX	#040B23
RGB	rgb(4, 11, 35)
HSL	hsl(226, 79%, 8%)
HSV	hsv(226, 89%, 14%)
CMYK	cmyk(88.6%, 68.6%, 0%, 86.3%)
CIE-LAB	lab(3.49, 4.33, -15.78)
CIE-LCH	lch(3.49, 16.36, 285.34°)
OKLab	oklab(15.94% -0.0038 -0.0518)
OKLCH	oklch(15.94% 0.052 265.8)
XYZ	xyz(0.4730, 0.3865, 1.6394)
Luminance	0.0039 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 8.38

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B23 #231C04

analogous

#041A23 #040B23 #0D0423

triadic

#040B23 #23040B #0B2304

tetradic

#040B23 #23041A #231C04 #04230D

square

#040B23 #23041A #231C04 #04230D

split-complementary

#040B23 #230D04 #1A2304

monochromatic

#03091B #03091B #040B23 #0A1C5A #112E91

Accessibility & contrast

On white

19.49

#040B23 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.08

#040B23 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B23

19.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B23	#FFFFFF	#000000	##FFFFFF
##040B23	1.00	19.49	1.08	19.49
#FFFFFF	19.49	1.00	21.00	1.00
#000000	1.08	21.00	1.00	21.00
##FFFFFF	19.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#010E24

Deuteranopia (green-blind)

#000B23

Tritanopia (blue-blind)

#001115

Achromatopsia (no color)

#0D0D0D

Design tokens & code

CSS

--color: #040b23;
/* rgb */ color: rgb(4, 11, 35);
/* oklch */ color: oklch(15.9% 0.052 265.8);

Tailwind

colors: {
  custom: {
    50: '#484c5e',
    500: '#040b23',
    950: '#000000',
  },
}

SCSS

$custom: #040b23;
$custom-light: #484c5e;
$custom-dark: #000000;

JSON

{
  "hex": "#040b23",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 35
  },
  "hsl": {
    "h": 226.452,
    "s": 79.487,
    "l": 7.647
  },
  "oklch": {
    "l": 0.15942,
    "c": 0.05191,
    "h": 265.8
  },
  "luminance": 0.00387
}

Semantic roles & 50–950 ramp

primary

#040B23

secondary

#66551D

accent

#CA32F6

background

#F4F4F5

surface

#E6E7E9

border

#C2C3C5

text

#000104

muted

#777779

Preview Lab

Preview with #040B23

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

Preview Lab → · Contrast checker → · Palette generator →