#040D2F#040D2F

#040D2F is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.7% C 0.070 H 266.0°. Best body text is #FFFFFF at 19.03:1 contrast (WCAG AA passes).

Color values

HEX	#040D2F
RGB	rgb(4, 13, 47)
HSL	hsl(227, 84%, 10%)
HSV	hsv(227, 91%, 18%)
CMYK	cmyk(91.5%, 72.3%, 0%, 81.6%)
CIE-LAB	lab(4.69, 8.76, -23.03)
CIE-LCH	lch(4.69, 24.64, 290.82°)
OKLab	oklab(17.73% -0.0048 -0.0696)
OKLCH	oklch(17.73% 0.07 266)
XYZ	xyz(0.7069, 0.5188, 2.7517)
Luminance	0.0052 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 4.60

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040D2F #2F2604

analogous

#04222F #040D2F #11042F

triadic

#040D2F #2F040D #0D2F04

tetradic

#040D2F #2F0422 #2F2604 #042F11

square

#040D2F #2F0422 #2F2604 #042F11

split-complementary

#040D2F #2F1104 #222F04

monochromatic

#02081C #02081C #040D2F #091D67 #0E2CA0

Accessibility & contrast

On white

19.03

#040D2F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040D2F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040D2F

19.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040D2F	#FFFFFF	#000000	##FFFFFF
##040D2F	1.00	19.03	1.10	19.03
#FFFFFF	19.03	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001230

Deuteranopia (green-blind)

#000E2E

Tritanopia (blue-blind)

#00161C

Achromatopsia (no color)

#101010

Design tokens & code

CSS

--color: #040d2f;
/* rgb */ color: rgb(4, 13, 47);
/* oklch */ color: oklch(17.7% 0.070 266.0);

Tailwind

colors: {
  custom: {
    50: '#4a4c68',
    500: '#040d2f',
    950: '#000000',
  },
}

SCSS

$custom: #040d2f;
$custom-light: #4a4c68;
$custom-dark: #000000;

JSON

{
  "hex": "#040d2f",
  "rgb": {
    "r": 4,
    "g": 13,
    "b": 47
  },
  "hsl": {
    "h": 227.442,
    "s": 84.314,
    "l": 10
  },
  "oklch": {
    "l": 0.17726,
    "c": 0.06973,
    "h": 266
  },
  "luminance": 0.00519
}

Semantic roles & 50–950 ramp

primary

#040D2F

secondary

#72601D

accent

#D02DFB

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040D2F

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

Preview Lab → · Contrast checker → · Palette generator →