#173B88#173B88

#173B88 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.136 H 262.8°. Best body text is #FFFFFF at 10.41:1 contrast (WCAG AA passes).

Color values

HEX	#173B88
RGB	rgb(23, 59, 136)
HSL	hsl(221, 71%, 31%)
HSV	hsv(221, 83%, 53%)
CMYK	cmyk(83.1%, 56.6%, 0%, 46.7%)
CIE-LAB	lab(26.98, 17.73, -46.60)
CIE-LCH	lch(26.98, 49.86, 290.83°)
OKLab	oklab(37.68% -0.017 -0.1345)
OKLCH	oklch(37.68% 0.136 262.8)
XYZ	xyz(6.3597, 5.0869, 23.9345)
Luminance	0.0509 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B88 #886417

analogous

#177388 #173B88 #2B1788

triadic

#173B88 #88173B #3B8817

tetradic

#173B88 #881773 #886417 #17882B

square

#173B88 #881773 #886417 #17882B

split-complementary

#173B88 #882B17 #738817

monochromatic

#050E1F #0E2454 #173B88 #2052BC #3B6FDE

Accessibility & contrast

On white

10.41

#173B88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173B88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B88

10.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B88	#FFFFFF	#000000	##FFFFFF
##173B88	1.00	10.41	2.02	10.41
#FFFFFF	10.41	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458B

Deuteranopia (green-blind)

#003B86

Tritanopia (blue-blind)

#004E5B

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173b88;
/* rgb */ color: rgb(23, 59, 136);
/* oklch */ color: oklch(37.7% 0.136 262.8);

Tailwind

colors: {
  custom: {
    50: '#6970ab',
    500: '#173b88',
    950: '#000000',
  },
}

SCSS

$custom: #173b88;
$custom-light: #6970ab;
$custom-dark: #000000;

JSON

{
  "hex": "#173b88",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 136
  },
  "hsl": {
    "h": 220.885,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.37677,
    "c": 0.13556,
    "h": 262.8
  },
  "luminance": 0.05088
}

Semantic roles & 50–950 ramp

primary

#173B88

secondary

#BC943F

accent

#B53AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173B88

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

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