#040F3F#040F3F

#040F3F is a very dark, moderate blue. Relative luminance 0.007; OKLCH L 20.0% C 0.092 H 266.0°. Best body text is #FFFFFF at 18.34:1 contrast (WCAG AA passes).

Color values

HEX	#040F3F
RGB	rgb(4, 15, 63)
HSL	hsl(229, 88%, 13%)
HSV	hsv(229, 94%, 25%)
CMYK	cmyk(93.7%, 76.2%, 0%, 75.3%)
CIE-LAB	lab(6.56, 16.46, -31.67)
CIE-LCH	lch(6.56, 35.70, 297.47°)
OKLab	oklab(20.03% -0.0064 -0.0923)
OKLCH	oklch(20.03% 0.092 266)
XYZ	xyz(1.1178, 0.7262, 4.7829)
Luminance	0.0073 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040F3F #3F3404

analogous

#042C3F #040F3F #16043F

triadic

#040F3F #3F040F #0F3F04

tetradic

#040F3F #3F042C #3F3404 #043F16

square

#040F3F #3F042C #3F3404 #043F16

split-complementary

#040F3F #3F1604 #2C3F04

monochromatic

#02071D #02071D #040F3F #081D79 #0B2AB2

Accessibility & contrast

On white

18.34

#040F3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.15

#040F3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040F3F

18.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040F3F	#FFFFFF	#000000	##FFFFFF
##040F3F	1.00	18.34	1.15	18.34
#FFFFFF	18.34	1.00	21.00	1.00
#000000	1.15	21.00	1.00	21.00
##FFFFFF	18.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001740

Deuteranopia (green-blind)

#00123E

Tritanopia (blue-blind)

#001C25

Achromatopsia (no color)

#151515

Design tokens & code

CSS

--color: #040f3f;
/* rgb */ color: rgb(4, 15, 63);
/* oklch */ color: oklch(20.0% 0.092 266.0);

Tailwind

colors: {
  custom: {
    50: '#514d75',
    500: '#040f3f',
    950: '#000000',
  },
}

SCSS

$custom: #040f3f;
$custom-light: #514d75;
$custom-dark: #000000;

JSON

{
  "hex": "#040f3f",
  "rgb": {
    "r": 4,
    "g": 15,
    "b": 63
  },
  "hsl": {
    "h": 228.814,
    "s": 88.06,
    "l": 13.137
  },
  "oklch": {
    "l": 0.20025,
    "c": 0.09249,
    "h": 266
  },
  "luminance": 0.00726
}

Semantic roles & 50–950 ramp

primary

#040F3F

secondary

#806E1E

accent

#D72AFE

background

#F4F4F7

surface

#E7E7ED

border

#C3C3C8

text

#020108

muted

#78777B

Preview Lab

Preview with #040F3F

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

Preview Lab → · Contrast checker → · Palette generator →