#040A2B#040A2B

#040A2B is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.5% C 0.068 H 267.9°. Best body text is #FFFFFF at 19.38:1 contrast (WCAG AA passes).

Color values

HEX	#040A2B
RGB	rgb(4, 10, 43)
HSL	hsl(231, 83%, 9%)
HSV	hsv(231, 91%, 17%)
CMYK	cmyk(90.7%, 76.7%, 0%, 83.1%)
CIE-LAB	lab(3.77, 8.11, -21.48)
CIE-LCH	lch(3.77, 22.96, 290.69°)
OKLab	oklab(16.55% -0.0024 -0.0675)
OKLCH	oklch(16.55% 0.068 267.9)
XYZ	xyz(0.5945, 0.4172, 2.3342)
Luminance	0.0042 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.12

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A2B #2B2504

analogous

#041E2B #040A2B #12042B

triadic

#040A2B #2B040A #0A2B04

tetradic

#040A2B #2B041E #2B2504 #042B12

square

#040A2B #2B041E #2B2504 #042B12

split-complementary

#040A2B #2B1204 #1E2B04

monochromatic

#03071C #03071C #040A2B #091763 #0E249B

Accessibility & contrast

On white

19.38

#040A2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.08

#040A2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A2B

19.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A2B	#FFFFFF	#000000	##FFFFFF
##040A2B	1.00	19.38	1.08	19.38
#FFFFFF	19.38	1.00	21.00	1.00
#000000	1.08	21.00	1.00	21.00
##FFFFFF	19.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#000F2C

Deuteranopia (green-blind)

#000C2A

Tritanopia (blue-blind)

#001319

Achromatopsia (no color)

#0D0D0D

Design tokens & code

CSS

--color: #040a2b;
/* rgb */ color: rgb(4, 10, 43);
/* oklch */ color: oklch(16.5% 0.068 267.9);

Tailwind

colors: {
  custom: {
    50: '#494b64',
    500: '#040a2b',
    950: '#000000',
  },
}

SCSS

$custom: #040a2b;
$custom-light: #494b64;
$custom-dark: #000000;

JSON

{
  "hex": "#040a2b",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 43
  },
  "hsl": {
    "h": 230.769,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.16549,
    "c": 0.06758,
    "h": 267.9
  },
  "luminance": 0.00417
}

Semantic roles & 50–950 ramp

primary

#040A2B

secondary

#6E611D

accent

#DA2EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040A2B

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

Preview Lab → · Contrast checker → · Palette generator →