#03173B#03173B

#03173B is a very dark, moderate blue. Relative luminance 0.009; OKLCH L 21.4% C 0.075 H 259.9°. Best body text is #FFFFFF at 17.65:1 contrast (WCAG AA passes).

Color values

HEX	#03173B
RGB	rgb(3, 23, 59)
HSL	hsl(219, 90%, 12%)
HSV	hsv(219, 95%, 23%)
CMYK	cmyk(94.9%, 61%, 0%, 76.9%)
CIE-LAB	lab(8.55, 8.41, -25.57)
CIE-LCH	lch(8.55, 26.92, 288.20°)
OKLab	oklab(21.44% -0.0131 -0.0738)
OKLCH	oklch(21.44% 0.075 259.9)
XYZ	xyz(1.1331, 0.9478, 4.2600)
Luminance	0.0095 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#03173B #3B2703

analogous

#03333B #03173B #0B033B

triadic

#03173B #3B0317 #173B03

tetradic

#03173B #3B0333 #3B2703 #033B0B

square

#03173B #3B0333 #3B2703 #033B0B

split-complementary

#03173B #3B0B03 #333B03

monochromatic

#010B1D #010B1D #03173B #062E75 #0944AF

Accessibility & contrast

On white

17.65

#03173B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.19

#03173B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #03173B

17.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##03173B	#FFFFFF	#000000	##FFFFFF
##03173B	1.00	17.65	1.19	17.65
#FFFFFF	17.65	1.00	21.00	1.00
#000000	1.19	21.00	1.00	21.00
##FFFFFF	17.65	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: #03173b;
/* rgb */ color: rgb(3, 23, 59);
/* oklch */ color: oklch(21.4% 0.075 259.9);

Tailwind

colors: {
  custom: {
    50: '#4e5371',
    500: '#03173b',
    950: '#000000',
  },
}

SCSS

$custom: #03173b;
$custom-light: #4e5371;
$custom-dark: #000000;

JSON

{
  "hex": "#03173b",
  "rgb": {
    "r": 3,
    "g": 23,
    "b": 59
  },
  "hsl": {
    "h": 218.571,
    "s": 90.323,
    "l": 12.157
  },
  "oklch": {
    "l": 0.21441,
    "c": 0.07495,
    "h": 259.9
  },
  "luminance": 0.00948
}

Semantic roles & 50–950 ramp

primary

#03173B

secondary

#7E5B1C

accent

#B229FF

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020208

muted

#78787B

Preview Lab

Preview with #03173B

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

Preview Lab → · Contrast checker → · Palette generator →