#040B3B#040B3B

#040B3B is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.7% C 0.092 H 267.4°. Best body text is #FFFFFF at 18.81:1 contrast (WCAG AA passes).

Color values

HEX	#040B3B
RGB	rgb(4, 11, 59)
HSL	hsl(232, 87%, 12%)
HSV	hsv(232, 93%, 23%)
CMYK	cmyk(93.2%, 81.4%, 0%, 76.9%)
CIE-LAB	lab(5.25, 16.46, -30.94)
CIE-LCH	lch(5.25, 35.04, 298.02°)
OKLab	oklab(18.71% -0.0042 -0.0916)
OKLCH	oklch(18.71% 0.092 267.4)
XYZ	xyz(0.9589, 0.5808, 4.1984)
Luminance	0.0058 (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

#040B3B #3B3404

analogous

#04263B #040B3B #19043B

triadic

#040B3B #3B040B #0B3B04

tetradic

#040B3B #3B0426 #3B3404 #043B19

square

#040B3B #3B0426 #3B3404 #043B19

split-complementary

#040B3B #3B1904 #263B04

monochromatic

#02051D #02051D #040B3B #081674 #0C20AE

Accessibility & contrast

On white

18.81

#040B3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040B3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B3B

18.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B3B	#FFFFFF	#000000	##FFFFFF
##040B3B	1.00	18.81	1.12	18.81
#FFFFFF	18.81	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00143C

Deuteranopia (green-blind)

#000F3A

Tritanopia (blue-blind)

#001922

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040b3b;
/* rgb */ color: rgb(4, 11, 59);
/* oklch */ color: oklch(18.7% 0.092 267.4);

Tailwind

colors: {
  custom: {
    50: '#4f4b71',
    500: '#040b3b',
    950: '#000000',
  },
}

SCSS

$custom: #040b3b;
$custom-light: #4f4b71;
$custom-dark: #000000;

JSON

{
  "hex": "#040b3b",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 59
  },
  "hsl": {
    "h": 232.364,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.18709,
    "c": 0.09174,
    "h": 267.4
  },
  "luminance": 0.00581
}

Semantic roles & 50–950 ramp

primary

#040B3B

secondary

#7D711E

accent

#E32AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020108

muted

#78777B

Preview Lab

Preview with #040B3B

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

Preview Lab → · Contrast checker → · Palette generator →