#173B89#173B89

#173B89 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.137 H 262.9°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#173B89
RGB	rgb(23, 59, 137)
HSL	hsl(221, 71%, 31%)
HSV	hsv(221, 83%, 54%)
CMYK	cmyk(83.2%, 56.9%, 0%, 46.3%)
CIE-LAB	lab(27.06, 18.14, -47.09)
CIE-LCH	lch(27.06, 50.46, 291.06°)
OKLab	oklab(37.76% -0.0169 -0.1359)
OKLCH	oklch(37.76% 0.137 262.9)
XYZ	xyz(6.4311, 5.1155, 24.3105)
Luminance	0.0512 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B89 #896517

analogous

#177489 #173B89 #2C1789

triadic

#173B89 #89173B #3B8917

tetradic

#173B89 #891774 #896517 #17892C

square

#173B89 #891774 #896517 #17892C

split-complementary

#173B89 #892C17 #748917

monochromatic

#050E20 #0E2455 #173B89 #2052BD #3C6FDE

Accessibility & contrast

On white

10.38

#173B89 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173B89 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B89

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B89	#FFFFFF	#000000	##FFFFFF
##173B89	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)

#00458C

Deuteranopia (green-blind)

#003B87

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173b89;
/* rgb */ color: rgb(23, 59, 137);
/* oklch */ color: oklch(37.8% 0.137 262.9);

Tailwind

colors: {
  custom: {
    50: '#6970ac',
    500: '#173b89',
    950: '#000000',
  },
}

SCSS

$custom: #173b89;
$custom-light: #6970ac;
$custom-dark: #000000;

JSON

{
  "hex": "#173b89",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 137
  },
  "hsl": {
    "h": 221.053,
    "s": 71.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.37763,
    "c": 0.13698,
    "h": 262.9
  },
  "luminance": 0.05116
}

Semantic roles & 50–950 ramp

primary

#173B89

secondary

#BD953F

accent

#B53AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173B89

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

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