#040D3B#040D3B

#040D3B is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 19.1% C 0.089 H 266.7°. Best body text is #FFFFFF at 18.65:1 contrast (WCAG AA passes).

Color values

HEX	#040D3B
RGB	rgb(4, 13, 59)
HSL	hsl(230, 87%, 12%)
HSV	hsv(230, 93%, 23%)
CMYK	cmyk(93.2%, 78%, 0%, 76.9%)
CIE-LAB	lab(5.68, 15.47, -30.22)
CIE-LCH	lch(5.68, 33.95, 297.11°)
OKLab	oklab(19.12% -0.0052 -0.0889)
OKLCH	oklch(19.12% 0.089 266.7)
XYZ	xyz(0.9831, 0.6293, 4.2065)
Luminance	0.0063 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040D3B #3B3204

analogous

#04293B #040D3B #17043B

triadic

#040D3B #3B040D #0D3B04

tetradic

#040D3B #3B0429 #3B3204 #043B17

square

#040D3B #3B0429 #3B3204 #043B17

split-complementary

#040D3B #3B1704 #293B04

monochromatic

#02061D #02061D #040D3B #081A74 #0C26AE

Accessibility & contrast

On white

18.65

#040D3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.13

#040D3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040D3B

18.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040D3B	#FFFFFF	#000000	##FFFFFF
##040D3B	1.00	18.65	1.13	18.65
#FFFFFF	18.65	1.00	21.00	1.00
#000000	1.13	21.00	1.00	21.00
##FFFFFF	18.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00153C

Deuteranopia (green-blind)

#00103A

Tritanopia (blue-blind)

#001A22

Achromatopsia (no color)

#131313

Design tokens & code

CSS

--color: #040d3b;
/* rgb */ color: rgb(4, 13, 59);
/* oklch */ color: oklch(19.1% 0.089 266.7);

Tailwind

colors: {
  custom: {
    50: '#4f4c71',
    500: '#040d3b',
    950: '#000000',
  },
}

SCSS

$custom: #040d3b;
$custom-light: #4f4c71;
$custom-dark: #000000;

JSON

{
  "hex": "#040d3b",
  "rgb": {
    "r": 4,
    "g": 13,
    "b": 59
  },
  "hsl": {
    "h": 230.182,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.19119,
    "c": 0.08907,
    "h": 266.7
  },
  "luminance": 0.00629
}

Semantic roles & 50–950 ramp

primary

#040D3B

secondary

#7D6D1E

accent

#DB2AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020108

muted

#78777B

Preview Lab

Preview with #040D3B

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

Preview Lab → · Contrast checker → · Palette generator →