#040A3A#040A3A

#040A3A is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 18.4% C 0.092 H 267.7°. Best body text is #FFFFFF at 18.93:1 contrast (WCAG AA passes).

Color values

HEX	#040A3A
RGB	rgb(4, 10, 58)
HSL	hsl(233, 87%, 12%)
HSV	hsv(233, 93%, 23%)
CMYK	cmyk(93.1%, 82.8%, 0%, 77.3%)
CIE-LAB	lab(4.95, 16.33, -30.69)
CIE-LCH	lch(4.95, 34.76, 298.01°)
OKLab	oklab(18.39% -0.0036 -0.0914)
OKLCH	oklch(18.39% 0.092 267.7)
XYZ	xyz(0.9221, 0.5483, 4.0594)
Luminance	0.0055 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Dark Navy

#000435

ΔE00 1.40

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A3A #3A3404

analogous

#04253A #040A3A #19043A

triadic

#040A3A #3A040A #0A3A04

tetradic

#040A3A #3A0425 #3A3404 #043A19

square

#040A3A #3A0425 #3A3404 #043A19

split-complementary

#040A3A #3A1904 #253A04

monochromatic

#02051D #02051D #040A3A #081473 #0C1EAD

Accessibility & contrast

On white

18.93

#040A3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#040A3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A3A

18.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A3A	#FFFFFF	#000000	##FFFFFF
##040A3A	1.00	18.93	1.11	18.93
#FFFFFF	18.93	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00133B

Deuteranopia (green-blind)

#000E39

Tritanopia (blue-blind)

#001821

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #040a3a;
/* rgb */ color: rgb(4, 10, 58);
/* oklch */ color: oklch(18.4% 0.092 267.7);

Tailwind

colors: {
  custom: {
    50: '#4f4a71',
    500: '#040a3a',
    950: '#000000',
  },
}

SCSS

$custom: #040a3a;
$custom-light: #4f4a71;
$custom-dark: #000000;

JSON

{
  "hex": "#040a3a",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 58
  },
  "hsl": {
    "h": 233.333,
    "s": 87.097,
    "l": 12.157
  },
  "oklch": {
    "l": 0.18386,
    "c": 0.09151,
    "h": 267.7
  },
  "luminance": 0.00548
}

Semantic roles & 50–950 ramp

primary

#040A3A

secondary

#7C711E

accent

#E62BFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020107

muted

#78777A

Preview Lab

Preview with #040A3A

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

Preview Lab → · Contrast checker → · Palette generator →