#173C88#173C88

#173C88 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.134 H 262.4°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#173C88
RGB	rgb(23, 60, 136)
HSL	hsl(220, 71%, 31%)
HSV	hsv(220, 83%, 53%)
CMYK	cmyk(83.1%, 55.9%, 0%, 46.7%)
CIE-LAB	lab(27.27, 17.02, -46.13)
CIE-LCH	lch(27.27, 49.17, 290.26°)
OKLab	oklab(37.9% -0.0177 -0.1331)
OKLCH	oklch(37.9% 0.134 262.4)
XYZ	xyz(6.4115, 5.1907, 23.9518)
Luminance	0.0519 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C88 #886317

analogous

#177488 #173C88 #2A1788

triadic

#173C88 #88173C #3C8817

tetradic

#173C88 #881774 #886317 #17882A

square

#173C88 #881774 #886317 #17882A

split-complementary

#173C88 #882A17 #748817

monochromatic

#050E1F #0E2554 #173C88 #2053BC #3B71DE

Accessibility & contrast

On white

10.30

#173C88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173C88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C88

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C88	#FFFFFF	#000000	##FFFFFF
##173C88	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468B

Deuteranopia (green-blind)

#003C87

Tritanopia (blue-blind)

#004F5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173c88;
/* rgb */ color: rgb(23, 60, 136);
/* oklch */ color: oklch(37.9% 0.134 262.4);

Tailwind

colors: {
  custom: {
    50: '#6971ab',
    500: '#173c88',
    950: '#000000',
  },
}

SCSS

$custom: #173c88;
$custom-light: #6971ab;
$custom-dark: #000000;

JSON

{
  "hex": "#173c88",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 136
  },
  "hsl": {
    "h": 220.354,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.37897,
    "c": 0.13426,
    "h": 262.4
  },
  "luminance": 0.05191
}

Semantic roles & 50–950 ramp

primary

#173C88

secondary

#BC933F

accent

#B33AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173C88

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

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