#040C3B#040C3B

#040C3B is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.9% C 0.090 H 267.0°. Best body text is #FFFFFF at 18.73:1 contrast (WCAG AA passes).

Color values

HEX	#040C3B
RGB	rgb(4, 12, 59)
HSL	hsl(231, 87%, 12%)
HSV	hsv(231, 93%, 23%)
CMYK	cmyk(93.2%, 79.7%, 0%, 76.9%)
CIE-LAB	lab(5.46, 15.98, -30.59)
CIE-LCH	lch(5.46, 34.51, 297.59°)
OKLab	oklab(18.91% -0.0047 -0.0903)
OKLCH	oklch(18.91% 0.09 267)
XYZ	xyz(0.9707, 0.6044, 4.2023)
Luminance	0.0060 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Dark Navy

#000435

ΔE00 1.56

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040C3B #3B3304

analogous

#04273B #040C3B #18043B

triadic

#040C3B #3B040C #0C3B04

tetradic

#040C3B #3B0427 #3B3304 #043B18

square

#040C3B #3B0427 #3B3304 #043B18

split-complementary

#040C3B #3B1804 #273B04

monochromatic

#02061D #02061D #040C3B #081874 #0C23AE

Accessibility & contrast

On white

18.73

#040C3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040C3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040C3B

18.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040C3B	#FFFFFF	#000000	##FFFFFF
##040C3B	1.00	18.73	1.12	18.73
#FFFFFF	18.73	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00153C

Deuteranopia (green-blind)

#000F3A

Tritanopia (blue-blind)

#001922

Achromatopsia (no color)

#121212

Design tokens & code

CSS

--color: #040c3b;
/* rgb */ color: rgb(4, 12, 59);
/* oklch */ color: oklch(18.9% 0.090 267.0);

Tailwind

colors: {
  custom: {
    50: '#4f4b71',
    500: '#040c3b',
    950: '#000000',
  },
}

SCSS

$custom: #040c3b;
$custom-light: #4f4b71;
$custom-dark: #000000;

JSON

{
  "hex": "#040c3b",
  "rgb": {
    "r": 4,
    "g": 12,
    "b": 59
  },
  "hsl": {
    "h": 231.273,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.18911,
    "c": 0.09042,
    "h": 267
  },
  "luminance": 0.00605
}

Semantic roles & 50–950 ramp

primary

#040C3B

secondary

#7D6F1E

accent

#DF2AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020108

muted

#78777B

Preview Lab

Preview with #040C3B

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

Preview Lab → · Contrast checker → · Palette generator →