#04173B#04173B

#04173B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.5% C 0.074 H 260.7°. Best body text is #FFFFFF at 17.64:1 contrast (WCAG AA passes).

Color values

HEX	#04173B
RGB	rgb(4, 23, 59)
HSL	hsl(219, 87%, 12%)
HSV	hsv(219, 93%, 23%)
CMYK	cmyk(93.2%, 61%, 0%, 76.9%)
CIE-LAB	lab(8.60, 8.59, -25.48)
CIE-LCH	lch(8.60, 26.89, 288.63°)
OKLab	oklab(21.5% -0.012 -0.0735)
OKLCH	oklch(21.5% 0.074 260.7)
XYZ	xyz(1.1456, 0.9542, 4.2606)
Luminance	0.0095 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#04173B #3B2804

analogous

#04333B #04173B #0D043B

triadic

#04173B #3B0417 #173B04

tetradic

#04173B #3B0433 #3B2804 #043B0D

square

#04173B #3B0433 #3B2804 #043B0D

split-complementary

#04173B #3B0D04 #333B04

monochromatic

#020B1D #020B1D #04173B #082D74 #0C44AE

Accessibility & contrast

On white

17.64

#04173B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.19

#04173B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #04173B

17.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##04173B	#FFFFFF	#000000	##FFFFFF
##04173B	1.00	17.64	1.19	17.64
#FFFFFF	17.64	1.00	21.00	1.00
#000000	1.19	21.00	1.00	21.00
##FFFFFF	17.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#011B3C

Deuteranopia (green-blind)

#00163A

Tritanopia (blue-blind)

#002026

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #04173b;
/* rgb */ color: rgb(4, 23, 59);
/* oklch */ color: oklch(21.5% 0.074 260.7);

Tailwind

colors: {
  custom: {
    50: '#4f5371',
    500: '#04173b',
    950: '#000000',
  },
}

SCSS

$custom: #04173b;
$custom-light: #4f5371;
$custom-dark: #000000;

JSON

{
  "hex": "#04173b",
  "rgb": {
    "r": 4,
    "g": 23,
    "b": 59
  },
  "hsl": {
    "h": 219.273,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.21499,
    "c": 0.07446,
    "h": 260.7
  },
  "luminance": 0.00954
}

Semantic roles & 50–950 ramp

primary

#04173B

secondary

#7D5C1E

accent

#B52AFD

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020208

muted

#78787B

Preview Lab

Preview with #04173B

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

Preview Lab → · Contrast checker → · Palette generator →