#040F33#040F33

#040F33 is a very dark, moderate blue. Relative luminance 0.006; OKLCH L 18.7% C 0.073 H 265.1°. Best body text is #FFFFFF at 18.73:1 contrast (WCAG AA passes).

Color values

HEX	#040F33
RGB	rgb(4, 15, 51)
HSL	hsl(226, 85%, 11%)
HSV	hsv(226, 92%, 20%)
CMYK	cmyk(92.2%, 70.6%, 0%, 80%)
CIE-LAB	lab(5.48, 9.91, -24.72)
CIE-LCH	lch(5.48, 26.63, 291.84°)
OKLab	oklab(18.66% -0.0063 -0.0731)
OKLCH	oklch(18.66% 0.073 265.1)
XYZ	xyz(0.8182, 0.6064, 3.2052)
Luminance	0.0061 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 4.04

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F33 #332804

analogous

#042633 #040F33 #100433

triadic

#040F33 #33040F #0F3304

tetradic

#040F33 #330426 #332804 #043310

square

#040F33 #330426 #332804 #043310

split-complementary

#040F33 #331004 #263304

monochromatic

#02081C #02081C #040F33 #08206C #0D30A4

Accessibility & contrast

On white

18.73

#040F33 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.12

#040F33 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F33

18.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F33	#FFFFFF	#000000	##FFFFFF
##040F33	1.00	18.73	1.12	18.73
#FFFFFF	18.73	1.00	21.00	1.00
#000000	1.12	21.00	1.00	21.00
##FFFFFF	18.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001434

Deuteranopia (green-blind)

#001032

Tritanopia (blue-blind)

#00181F

Achromatopsia (no color)

#121212

Design tokens & code

CSS

--color: #040f33;
/* rgb */ color: rgb(4, 15, 51);
/* oklch */ color: oklch(18.7% 0.073 265.1);

Tailwind

colors: {
  custom: {
    50: '#4c4d6b',
    500: '#040f33',
    950: '#000000',
  },
}

SCSS

$custom: #040f33;
$custom-light: #4c4d6b;
$custom-dark: #000000;

JSON

{
  "hex": "#040f33",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 51
  },
  "hsl": {
    "h": 225.957,
    "s": 85.455,
    "l": 10.784
  },
  "oklch": {
    "l": 0.18655,
    "c": 0.07336,
    "h": 265.1
  },
  "luminance": 0.00606
}

Semantic roles & 50–950 ramp

primary

#040F33

secondary

#75611D

accent

#CB2CFC

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040F33

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

Preview Lab → · Contrast checker → · Palette generator →