#040B31#040B31

#040B31 is a very dark, moderate blue. Relative luminance 0.005; OKLCH L 17.5% C 0.076 H 267.5°. Best body text is #FFFFFF at 19.14:1 contrast (WCAG AA passes).

Color values

HEX	#040B31
RGB	rgb(4, 11, 49)
HSL	hsl(231, 85%, 10%)
HSV	hsv(231, 92%, 19%)
CMYK	cmyk(91.8%, 77.6%, 0%, 80.8%)
CIE-LAB	lab(4.40, 10.70, -24.98)
CIE-LCH	lch(4.40, 27.17, 293.19°)
OKLab	oklab(17.48% -0.0034 -0.076)
OKLCH	oklch(17.48% 0.076 267.5)
XYZ	xyz(0.7239, 0.4868, 2.9609)
Luminance	0.0049 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 3.47

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B31 #312A04

analogous

#042131 #040B31 #130431

triadic

#040B31 #31040B #0B3104

tetradic

#040B31 #310421 #312A04 #043113

square

#040B31 #310421 #312A04 #043113

split-complementary

#040B31 #311304 #213104

monochromatic

#02061C #02061C #040B31 #09186A #0D24A2

Accessibility & contrast

On white

19.14

#040B31 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.10

#040B31 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B31

19.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B31	#FFFFFF	#000000	##FFFFFF
##040B31	1.00	19.14	1.10	19.14
#FFFFFF	19.14	1.00	21.00	1.00
#000000	1.10	21.00	1.00	21.00
##FFFFFF	19.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001132

Deuteranopia (green-blind)

#000D30

Tritanopia (blue-blind)

#00151C

Achromatopsia (no color)

#0F0F0F

Design tokens & code

CSS

--color: #040b31;
/* rgb */ color: rgb(4, 11, 49);
/* oklch */ color: oklch(17.5% 0.076 267.5);

Tailwind

colors: {
  custom: {
    50: '#4b4b69',
    500: '#040b31',
    950: '#000000',
  },
}

SCSS

$custom: #040b31;
$custom-light: #4b4b69;
$custom-dark: #000000;

JSON

{
  "hex": "#040b31",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 49
  },
  "hsl": {
    "h": 230.667,
    "s": 84.906,
    "l": 10.392
  },
  "oklch": {
    "l": 0.17481,
    "c": 0.07606,
    "h": 267.5
  },
  "luminance": 0.00487
}

Semantic roles & 50–950 ramp

primary

#040B31

secondary

#73661D

accent

#DB2DFB

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040B31

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

Preview Lab → · Contrast checker → · Palette generator →