#040540#040540

#040540 is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 18.2% C 0.107 H 268.4°. Best body text is #FFFFFF at 19.07:1 contrast (WCAG AA passes).

Color values

HEX	#040540
RGB	rgb(4, 5, 64)
HSL	hsl(239, 88%, 13%)
HSV	hsv(239, 94%, 25%)
CMYK	cmyk(93.8%, 92.2%, 0%, 74.9%)
CIE-LAB	lab(4.56, 22.02, -35.66)
CIE-LCH	lch(4.56, 41.91, 301.69°)
OKLab	oklab(18.23% -0.003 -0.1066)
OKLCH	oklch(18.23% 0.107 268.4)
XYZ	xyz(1.0294, 0.5044, 4.8926)
Luminance	0.0050 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Night Blue

#040348

ΔE00 2.32

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040540 #403F04

analogous

#042340 #040540 #210440

triadic

#040540 #400405 #054004

tetradic

#040540 #400423 #403F04 #044021

square

#040540 #400423 #403F04 #044021

split-complementary

#040540 #402104 #234004

monochromatic

#02021D #02021D #040540 #080A7A #0B0EB3

Accessibility & contrast

On white

19.07

#040540 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040540 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040540

19.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040540	#FFFFFF	#000000	##FFFFFF
##040540	1.00	19.07	1.10	19.07
#FFFFFF	19.07	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001342

Deuteranopia (green-blind)

#000C3F

Tritanopia (blue-blind)

#001823

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040540;
/* rgb */ color: rgb(4, 5, 64);
/* oklch */ color: oklch(18.2% 0.107 268.4);

Tailwind

colors: {
  custom: {
    50: '#514776',
    500: '#040540',
    950: '#000000',
  },
}

SCSS

$custom: #040540;
$custom-light: #514776;
$custom-dark: #000000;

JSON

{
  "hex": "#040540",
  "rgb": {
    "r": 4,
    "g": 5,
    "b": 64
  },
  "hsl": {
    "h": 239,
    "s": 88.235,
    "l": 13.333
  },
  "oklch": {
    "l": 0.1823,
    "c": 0.10662,
    "h": 268.4
  },
  "luminance": 0.00505
}

Semantic roles & 50–950 ramp

primary

#040540

secondary

#81801F

accent

#FB29FE

background

#F4F4F7

surface

#E8E6ED

border

#C4C2C8

text

#030008

muted

#78777B

Preview Lab

Preview with #040540

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

Preview Lab → · Contrast checker → · Palette generator →