#040A3F#040A3F

#040A3F is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 19.0% C 0.099 H 267.5°. Best body text is #FFFFFF at 18.74:1 contrast (WCAG AA passes).

Color values

HEX	#040A3F
RGB	rgb(4, 10, 63)
HSL	hsl(234, 88%, 13%)
HSV	hsv(234, 94%, 25%)
CMYK	cmyk(93.7%, 84.1%, 0%, 75.3%)
CIE-LAB	lab(5.43, 19.16, -33.51)
CIE-LCH	lch(5.43, 38.60, 299.76°)
OKLab	oklab(19.04% -0.0043 -0.0988)
OKLCH	oklch(19.04% 0.099 267.5)
XYZ	xyz(1.0555, 0.6016, 4.7622)
Luminance	0.0060 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Navy Blue (survey)

#001146

ΔE00 2.00

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A3F #3F3904

analogous

#04273F #040A3F #1B043F

triadic

#040A3F #3F040A #0A3F04

tetradic

#040A3F #3F0427 #3F3904 #043F1B

square

#040A3F #3F0427 #3F3904 #043F1B

split-complementary

#040A3F #3F1B04 #273F04

monochromatic

#02051D #02051D #040A3F #081379 #0B1CB2

Accessibility & contrast

On white

18.74

#040A3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040A3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A3F

18.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A3F	#FFFFFF	#000000	##FFFFFF
##040A3F	1.00	18.74	1.12	18.74
#FFFFFF	18.74	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001541

Deuteranopia (green-blind)

#000F3E

Tritanopia (blue-blind)

#001A23

Achromatopsia (no color)

#121212

Design tokens & code

CSS

--color: #040a3f;
/* rgb */ color: rgb(4, 10, 63);
/* oklch */ color: oklch(19.0% 0.099 267.5);

Tailwind

colors: {
  custom: {
    50: '#514a75',
    500: '#040a3f',
    950: '#000000',
  },
}

SCSS

$custom: #040a3f;
$custom-light: #514a75;
$custom-dark: #000000;

JSON

{
  "hex": "#040a3f",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 63
  },
  "hsl": {
    "h": 233.898,
    "s": 88.06,
    "l": 13.137
  },
  "oklch": {
    "l": 0.19037,
    "c": 0.09892,
    "h": 267.5
  },
  "luminance": 0.00602
}

Semantic roles & 50–950 ramp

primary

#040A3F

secondary

#80761E

accent

#E92AFE

background

#F4F4F7

surface

#E7E7ED

border

#C3C3C8

text

#030108

muted

#78777B

Preview Lab

Preview with #040A3F

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

Preview Lab → · Contrast checker → · Palette generator →