#04102B#04102B

#04102B is a very dark, muted blue. Relative luminance 0.006; OKLCH L 18.1% C 0.058 H 262.2°. Best body text is #FFFFFF at 18.85:1 contrast (WCAG AA passes).

Color values

HEX	#04102B
RGB	rgb(4, 16, 43)
HSL	hsl(222, 83%, 9%)
HSV	hsv(222, 91%, 17%)
CMYK	cmyk(90.7%, 62.8%, 0%, 83.1%)
CIE-LAB	lab(5.16, 5.27, -19.29)
CIE-LCH	lch(5.16, 20.00, 285.30°)
OKLab	oklab(18.09% -0.0079 -0.0576)
OKLCH	oklch(18.09% 0.058 262.2)
XYZ	xyz(0.6712, 0.5707, 2.3598)
Luminance	0.0057 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.83

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04102B #2B1F04

analogous

#04242B #04102B #0C042B

triadic

#04102B #2B0410 #102B04

tetradic

#04102B #2B0424 #2B1F04 #042B0C

square

#04102B #2B0424 #2B1F04 #042B0C

split-complementary

#04102B #2B0C04 #242B04

monochromatic

#030A1C #030A1C #04102B #092563 #0E3A9B

Accessibility & contrast

On white

18.85

#04102B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.11

#04102B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04102B

18.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04102B	#FFFFFF	#000000	##FFFFFF
##04102B	1.00	18.85	1.11	18.85
#FFFFFF	18.85	1.00	21.00	1.00
#000000	1.11	21.00	1.00	21.00
##FFFFFF	18.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#02132C

Deuteranopia (green-blind)

#000F2A

Tritanopia (blue-blind)

#00171B

Achromatopsia (no color)

#111111

Design tokens & code

CSS

--color: #04102b;
/* rgb */ color: rgb(4, 16, 43);
/* oklch */ color: oklch(18.1% 0.058 262.2);

Tailwind

colors: {
  custom: {
    50: '#494e64',
    500: '#04102b',
    950: '#000000',
  },
}

SCSS

$custom: #04102b;
$custom-light: #494e64;
$custom-dark: #000000;

JSON

{
  "hex": "#04102b",
  "rgb": {
    "r": 4,
    "g": 16,
    "b": 43
  },
  "hsl": {
    "h": 221.538,
    "s": 82.979,
    "l": 9.216
  },
  "oklch": {
    "l": 0.18094,
    "c": 0.05814,
    "h": 262.2
  },
  "luminance": 0.00571
}

Semantic roles & 50–950 ramp

primary

#04102B

secondary

#6E551D

accent

#BB2EF9

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #04102B

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

Preview Lab → · Contrast checker → · Palette generator →