#040B3F#040B3F

#040B3F is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 19.2% C 0.098 H 267.3°. Best body text is #FFFFFF at 18.67:1 contrast (WCAG AA passes).

Color values

HEX	#040B3F
RGB	rgb(4, 11, 63)
HSL	hsl(233, 88%, 13%)
HSV	hsv(233, 94%, 25%)
CMYK	cmyk(93.7%, 82.5%, 0%, 75.3%)
CIE-LAB	lab(5.64, 18.68, -33.18)
CIE-LCH	lch(5.64, 38.08, 299.38°)
OKLab	oklab(19.22% -0.0047 -0.0976)
OKLCH	oklch(19.22% 0.098 267.3)
XYZ	xyz(1.0666, 0.6239, 4.7659)
Luminance	0.0062 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Navy Blue (survey)

#001146

ΔE00 1.85

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B3F #3F3804

analogous

#04283F #040B3F #1A043F

triadic

#040B3F #3F040B #0B3F04

tetradic

#040B3F #3F0428 #3F3804 #043F1A

square

#040B3F #3F0428 #3F3804 #043F1A

split-complementary

#040B3F #3F1A04 #283F04

monochromatic

#02051D #02051D #040B3F #081579 #0B1FB2

Accessibility & contrast

On white

18.67

#040B3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040B3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B3F

18.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B3F	#FFFFFF	#000000	##FFFFFF
##040B3F	1.00	18.67	1.12	18.67
#FFFFFF	18.67	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001541

Deuteranopia (green-blind)

#000F3E

Tritanopia (blue-blind)

#001A24

Achromatopsia (no color)

#121212

Design tokens & code

CSS

--color: #040b3f;
/* rgb */ color: rgb(4, 11, 63);
/* oklch */ color: oklch(19.2% 0.098 267.3);

Tailwind

colors: {
  custom: {
    50: '#514a75',
    500: '#040b3f',
    950: '#000000',
  },
}

SCSS

$custom: #040b3f;
$custom-light: #514a75;
$custom-dark: #000000;

JSON

{
  "hex": "#040b3f",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 63
  },
  "hsl": {
    "h": 232.881,
    "s": 88.06,
    "l": 13.137
  },
  "oklch": {
    "l": 0.19222,
    "c": 0.09771,
    "h": 267.3
  },
  "luminance": 0.00624
}

Semantic roles & 50–950 ramp

primary

#040B3F

secondary

#80751E

accent

#E52AFE

background

#F4F4F7

surface

#E7E7ED

border

#C3C3C8

text

#020108

muted

#78777B

Preview Lab

Preview with #040B3F

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

Preview Lab → · Contrast checker → · Palette generator →