#040F3B#040F3B

#040F3B is a very dark, moderate blue. Relative luminance 0.007; OKLCH L 19.6% C 0.086 H 265.8°. Best body text is #FFFFFF at 18.48:1 contrast (WCAG AA passes).

Color values

HEX	#040F3B
RGB	rgb(4, 15, 59)
HSL	hsl(228, 87%, 12%)
HSV	hsv(228, 93%, 23%)
CMYK	cmyk(93.2%, 74.6%, 0%, 76.9%)
CIE-LAB	lab(6.17, 14.36, -29.43)
CIE-LCH	lch(6.17, 32.75, 296.01°)
OKLab	oklab(19.55% -0.0063 -0.0861)
OKLCH	oklch(19.55% 0.086 265.8)
XYZ	xyz(1.0100, 0.6831, 4.2154)
Luminance	0.0068 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F3B #3B3004

analogous

#042B3B #040F3B #15043B

triadic

#040F3B #3B040F #0F3B04

tetradic

#040F3B #3B042B #3B3004 #043B15

square

#040F3B #3B042B #3B3004 #043B15

split-complementary

#040F3B #3B1504 #2B3B04

monochromatic

#02071D #02071D #040F3B #081E74 #0C2CAE

Accessibility & contrast

On white

18.48

#040F3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.14

#040F3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F3B

18.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F3B	#FFFFFF	#000000	##FFFFFF
##040F3B	1.00	18.48	1.14	18.48
#FFFFFF	18.48	1.00	21.00	1.00
#000000	1.14	21.00	1.00	21.00
##FFFFFF	18.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00163C

Deuteranopia (green-blind)

#00113A

Tritanopia (blue-blind)

#001B23

Achromatopsia (no color)

#141414

Design tokens & code

CSS

--color: #040f3b;
/* rgb */ color: rgb(4, 15, 59);
/* oklch */ color: oklch(19.6% 0.086 265.8);

Tailwind

colors: {
  custom: {
    50: '#4f4d71',
    500: '#040f3b',
    950: '#000000',
  },
}

SCSS

$custom: #040f3b;
$custom-light: #4f4d71;
$custom-dark: #000000;

JSON

{
  "hex": "#040f3b",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 59
  },
  "hsl": {
    "h": 228,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.19554,
    "c": 0.08629,
    "h": 265.8
  },
  "luminance": 0.00683
}

Semantic roles & 50–950 ramp

primary

#040F3B

secondary

#7D6A1E

accent

#D32AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020108

muted

#78777B

Preview Lab

Preview with #040F3B

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

Preview Lab → · Contrast checker → · Palette generator →