#173F79#173F79

#173F79 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.4% C 0.109 H 258.2°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#173F79
RGB	rgb(23, 63, 121)
HSL	hsl(216, 68%, 28%)
HSV	hsv(216, 81%, 47%)
CMYK	cmyk(81%, 47.9%, 0%, 52.5%)
CIE-LAB	lab(27.07, 8.71, -37.08)
CIE-LCH	lch(27.07, 38.09, 283.22°)
OKLab	oklab(37.39% -0.0223 -0.1064)
OKLCH	oklch(37.39% 0.109 258.2)
XYZ	xyz(5.5808, 5.1170, 18.7790)
Luminance	0.0512 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F79 #795117

analogous

#177079 #173F79 #201779

triadic

#173F79 #79173F #3F7917

tetradic

#173F79 #791770 #795117 #177920

square

#173F79 #791770 #795117 #177920

split-complementary

#173F79 #792017 #707917

monochromatic

#050D1A #0D2446 #173F79 #215AAC #3276D8

Accessibility & contrast

On white

10.38

#173F79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173F79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F79

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F79	#FFFFFF	#000000	##FFFFFF
##173F79	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#20457B

Deuteranopia (green-blind)

#083C78

Tritanopia (blue-blind)

#004D56

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173f79;
/* rgb */ color: rgb(23, 63, 121);
/* oklch */ color: oklch(37.4% 0.109 258.2);

Tailwind

colors: {
  custom: {
    50: '#6573a0',
    500: '#173f79',
    950: '#000000',
  },
}

SCSS

$custom: #173f79;
$custom-light: #6573a0;
$custom-dark: #000000;

JSON

{
  "hex": "#173f79",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 121
  },
  "hsl": {
    "h": 215.51,
    "s": 68.056,
    "l": 28.235
  },
  "oklch": {
    "l": 0.37386,
    "c": 0.1087,
    "h": 258.2
  },
  "luminance": 0.05118
}

Semantic roles & 50–950 ramp

primary

#173F79

secondary

#AE803E

accent

#A43DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080F

muted

#7A7B7E

Preview Lab

Preview with #173F79

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

Preview Lab → · Contrast checker → · Palette generator →