#04173F#04173F

#04173F is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.9% C 0.081 H 261.8°. Best body text is #FFFFFF at 17.51:1 contrast (WCAG AA passes).

Color values

HEX	#04173F
RGB	rgb(4, 23, 63)
HSL	hsl(221, 88%, 13%)
HSV	hsv(221, 94%, 25%)
CMYK	cmyk(93.7%, 63.5%, 0%, 75.3%)
CIE-LAB	lab(8.97, 10.50, -27.74)
CIE-LCH	lch(8.97, 29.66, 290.73°)
OKLab	oklab(21.89% -0.0115 -0.0801)
OKLCH	oklch(21.89% 0.081 261.8)
XYZ	xyz(1.2533, 0.9973, 4.8281)
Luminance	0.0100 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04173F #3F2C04

analogous

#04343F #04173F #0E043F

triadic

#04173F #3F0417 #173F04

tetradic

#04173F #3F0434 #3F2C04 #043F0E

square

#04173F #3F0434 #3F2C04 #043F0E

split-complementary

#04173F #3F0E04 #343F04

monochromatic

#020B1D #020B1D #04173F #082C79 #0B41B2

Accessibility & contrast

On white

17.51

#04173F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#04173F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04173F

17.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04173F	#FFFFFF	#000000	##FFFFFF
##04173F	1.00	17.51	1.20	17.51
#FFFFFF	17.51	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001C40

Deuteranopia (green-blind)

#00173E

Tritanopia (blue-blind)

#002128

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #04173f;
/* rgb */ color: rgb(4, 23, 63);
/* oklch */ color: oklch(21.9% 0.081 261.8);

Tailwind

colors: {
  custom: {
    50: '#505374',
    500: '#04173f',
    950: '#000000',
  },
}

SCSS

$custom: #04173f;
$custom-light: #505374;
$custom-dark: #000000;

JSON

{
  "hex": "#04173f",
  "rgb": {
    "r": 4,
    "g": 23,
    "b": 63
  },
  "hsl": {
    "h": 220.678,
    "s": 88.06,
    "l": 13.137
  },
  "oklch": {
    "l": 0.21892,
    "c": 0.08095,
    "h": 261.8
  },
  "luminance": 0.00997
}

Semantic roles & 50–950 ramp

primary

#04173F

secondary

#80611E

accent

#BA2AFE

background

#F4F4F7

surface

#E7E7ED

border

#C3C3C8

text

#020208

muted

#78787B

Preview Lab

Preview with #04173F

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

Preview Lab → · Contrast checker → · Palette generator →