#040B2F#040B2F

#040B2F is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.2% C 0.073 H 267.4°. Best body text is #FFFFFF at 19.20:1 contrast (WCAG AA passes).

Color values

HEX	#040B2F
RGB	rgb(4, 11, 47)
HSL	hsl(230, 84%, 10%)
HSV	hsv(230, 91%, 18%)
CMYK	cmyk(91.5%, 76.6%, 0%, 81.6%)
CIE-LAB	lab(4.25, 9.65, -23.72)
CIE-LCH	lch(4.25, 25.61, 292.15°)
OKLab	oklab(17.25% -0.0033 -0.0727)
OKLCH	oklch(17.25% 0.073 267.4)
XYZ	xyz(0.6827, 0.4703, 2.7436)
Luminance	0.0047 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 4.07

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B2F #2F2804

analogous

#04202F #040B2F #13042F

triadic

#040B2F #2F040B #0B2F04

tetradic

#040B2F #2F0420 #2F2804 #042F13

square

#040B2F #2F0420 #2F2804 #042F13

split-complementary

#040B2F #2F1304 #202F04

monochromatic

#02071C #02071C #040B2F #091867 #0E25A0

Accessibility & contrast

On white

19.20

#040B2F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040B2F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B2F

19.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B2F	#FFFFFF	#000000	##FFFFFF
##040B2F	1.00	19.20	1.09	19.20
#FFFFFF	19.20	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001130

Deuteranopia (green-blind)

#000D2E

Tritanopia (blue-blind)

#00141B

Achromatopsia (no color)

#0F0F0F

Design tokens & code

CSS

--color: #040b2f;
/* rgb */ color: rgb(4, 11, 47);
/* oklch */ color: oklch(17.2% 0.073 267.4);

Tailwind

colors: {
  custom: {
    50: '#4a4b68',
    500: '#040b2f',
    950: '#000000',
  },
}

SCSS

$custom: #040b2f;
$custom-light: #4a4b68;
$custom-dark: #000000;

JSON

{
  "hex": "#040b2f",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 47
  },
  "hsl": {
    "h": 230.233,
    "s": 84.314,
    "l": 10
  },
  "oklch": {
    "l": 0.17246,
    "c": 0.07276,
    "h": 267.4
  },
  "luminance": 0.0047
}

Semantic roles & 50–950 ramp

primary

#040B2F

secondary

#72641D

accent

#D92DFB

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040B2F

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

Preview Lab → · Contrast checker → · Palette generator →