#040B40#040B40

#040B40 is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 19.4% C 0.099 H 267.2°. Best body text is #FFFFFF at 18.63:1 contrast (WCAG AA passes).

Color values

HEX	#040B40
RGB	rgb(4, 11, 64)
HSL	hsl(233, 88%, 13%)
HSV	hsv(233, 94%, 25%)
CMYK	cmyk(93.8%, 82.8%, 0%, 74.9%)
CIE-LAB	lab(5.74, 19.22, -33.73)
CIE-LCH	lch(5.74, 38.82, 299.68°)
OKLab	oklab(19.35% -0.0048 -0.0991)
OKLCH	oklch(19.35% 0.099 267.2)
XYZ	xyz(1.0948, 0.6352, 4.9144)
Luminance	0.0063 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Navy Blue (survey)

#001146

ΔE00 1.82

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B40 #403904

analogous

#042940 #040B40 #1B0440

triadic

#040B40 #40040B #0B4004

tetradic

#040B40 #400429 #403904 #04401B

square

#040B40 #400429 #403904 #04401B

split-complementary

#040B40 #401B04 #294004

monochromatic

#02051D #02051D #040B40 #08157A #0B1FB3

Accessibility & contrast

On white

18.63

#040B40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.13

#040B40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B40

18.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B40	#FFFFFF	#000000	##FFFFFF
##040B40	1.00	18.63	1.13	18.63
#FFFFFF	18.63	1.00	21.00	1.00
#000000	1.13	21.00	1.00	21.00
##FFFFFF	18.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001642

Deuteranopia (green-blind)

#00103F

Tritanopia (blue-blind)

#001A24

Achromatopsia (no color)

#131313

Design tokens & code

CSS

--color: #040b40;
/* rgb */ color: rgb(4, 11, 64);
/* oklch */ color: oklch(19.4% 0.099 267.2);

Tailwind

colors: {
  custom: {
    50: '#514a75',
    500: '#040b40',
    950: '#000000',
  },
}

SCSS

$custom: #040b40;
$custom-light: #514a75;
$custom-dark: #000000;

JSON

{
  "hex": "#040b40",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 64
  },
  "hsl": {
    "h": 233,
    "s": 88.235,
    "l": 13.333
  },
  "oklch": {
    "l": 0.19351,
    "c": 0.09918,
    "h": 267.2
  },
  "luminance": 0.00635
}

Semantic roles & 50–950 ramp

primary

#040B40

secondary

#81761F

accent

#E629FE

background

#F4F4F7

surface

#E7E7ED

border

#C3C3C8

text

#030108

muted

#78777B

Preview Lab

Preview with #040B40

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

Preview Lab → · Contrast checker → · Palette generator →