#040A23#040A23

#040A23 is a very dark, muted blue. Relative luminance 0.004; OKLCH L 15.7% C 0.054 H 267.1°. Best body text is #FFFFFF at 19.57:1 contrast (WCAG AA passes).

Color values

HEX	#040A23
RGB	rgb(4, 10, 35)
HSL	hsl(228, 79%, 8%)
HSV	hsv(228, 89%, 14%)
CMYK	cmyk(88.6%, 71.4%, 0%, 86.3%)
CIE-LAB	lab(3.29, 4.74, -16.09)
CIE-LCH	lch(3.29, 16.77, 286.42°)
OKLab	oklab(15.67% -0.0027 -0.0535)
OKLCH	oklch(15.67% 0.054 267.1)
XYZ	xyz(0.4619, 0.3642, 1.6357)
Luminance	0.0036 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 8.14

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A23 #231D04

analogous

#041923 #040A23 #0D0423

triadic

#040A23 #23040A #0A2304

tetradic

#040A23 #230419 #231D04 #04230D

square

#040A23 #230419 #231D04 #04230D

split-complementary

#040A23 #230D04 #192304

monochromatic

#03081B #03081B #040A23 #0A1A5A #112991

Accessibility & contrast

On white

19.57

#040A23 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.07

#040A23 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A23

19.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A23	#FFFFFF	#000000	##FFFFFF
##040A23	1.00	19.57	1.07	19.57
#FFFFFF	19.57	1.00	21.00	1.00
#000000	1.07	21.00	1.00	21.00
##FFFFFF	19.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#000D24

Deuteranopia (green-blind)

#000A23

Tritanopia (blue-blind)

#001014

Achromatopsia (no color)

#0C0C0C

Design tokens & code

CSS

--color: #040a23;
/* rgb */ color: rgb(4, 10, 35);
/* oklch */ color: oklch(15.7% 0.054 267.1);

Tailwind

colors: {
  custom: {
    50: '#484b5e',
    500: '#040a23',
    950: '#000000',
  },
}

SCSS

$custom: #040a23;
$custom-light: #484b5e;
$custom-dark: #000000;

JSON

{
  "hex": "#040a23",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 35
  },
  "hsl": {
    "h": 228.387,
    "s": 79.487,
    "l": 7.647
  },
  "oklch": {
    "l": 0.15672,
    "c": 0.05356,
    "h": 267.1
  },
  "luminance": 0.00364
}

Semantic roles & 50–950 ramp

primary

#040A23

secondary

#66581D

accent

#D032F6

background

#F4F4F5

surface

#E6E7E9

border

#C2C3C5

text

#000104

muted

#777779

Preview Lab

Preview with #040A23

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

Preview Lab → · Contrast checker → · Palette generator →