#040023#040023

#040023 is a very dark, moderate blue. Relative luminance 0.001; OKLCH L 12.3% C 0.076 H 277.2°. Best body text is #FFFFFF at 20.40:1 contrast (WCAG AA passes).

Color values

HEX	#040023
RGB	rgb(4, 0, 35)
HSL	hsl(247, 100%, 7%)
HSV	hsv(247, 100%, 14%)
CMYK	cmyk(88.6%, 100%, 0%, 86.3%)
CIE-LAB	lab(1.33, 8.75, -19.11)
CIE-LCH	lch(1.33, 21.01, 294.59°)
OKLab	oklab(12.35% 0.0096 -0.0757)
OKLCH	oklch(12.35% 0.076 277.2)
XYZ	xyz(0.3533, 0.1471, 1.5996)
Luminance	0.0015 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040023 #1F2300

analogous

#000E23 #040023 #160023

triadic

#040023 #230400 #002304

tetradic

#040023 #23000E #1F2300 #002316

square

#040023 #23000E #1F2300 #002316

split-complementary

#040023 #231600 #0E2300

monochromatic

#03001F #03001F #040023 #0B0060 #12009D

Accessibility & contrast

On white

20.40

#040023 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.03

#040023 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040023

20.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040023	#FFFFFF	#000000	##FFFFFF
##040023	1.00	20.40	1.03	20.40
#FFFFFF	20.40	1.00	21.00	1.00
#000000	1.03	21.00	1.00	21.00
##FFFFFF	20.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#000624

Deuteranopia (green-blind)

#000422

Tritanopia (blue-blind)

#000810

Achromatopsia (no color)

#050505

Design tokens & code

CSS

--color: #040023;
/* rgb */ color: rgb(4, 0, 35);
/* oklch */ color: oklch(12.3% 0.076 277.2);

Tailwind

colors: {
  custom: {
    50: '#48475e',
    500: '#040023',
    950: '#000000',
  },
}

SCSS

$custom: #040023;
$custom-light: #48475e;
$custom-dark: #000000;

JSON

{
  "hex": "#040023",
  "rgb": {
    "r": 4,
    "g": 0,
    "b": 35
  },
  "hsl": {
    "h": 246.857,
    "s": 100,
    "l": 6.863
  },
  "oklch": {
    "l": 0.12347,
    "c": 0.07626,
    "h": 277.2
  },
  "luminance": 0.00147
}

Semantic roles & 50–950 ramp

primary

#040023

secondary

#626C13

accent

#FF29E7

background

#F4F3F5

surface

#E6E5E9

border

#C2C1C5

text

#000004

muted

#777779

Preview Lab

Preview with #040023

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

Preview Lab → · Contrast checker → · Palette generator →