#173B8C#173B8C

#173B8C is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.141 H 263.2°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#173B8C
RGB	rgb(23, 59, 140)
HSL	hsl(222, 72%, 32%)
HSV	hsv(222, 84%, 55%)
CMYK	cmyk(83.6%, 57.9%, 0%, 45.1%)
CIE-LAB	lab(27.30, 19.36, -48.55)
CIE-LCH	lch(27.30, 52.27, 291.74°)
OKLab	oklab(38.02% -0.0167 -0.1402)
OKLCH	oklch(38.02% 0.141 263.2)
XYZ	xyz(6.6492, 5.2027, 25.4596)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B8C #8C6817

analogous

#17768C #173B8C #2D178C

triadic

#173B8C #8C173B #3B8C17

tetradic

#173B8C #8C1776 #8C6817 #178C2D

square

#173B8C #8C1776 #8C6817 #178C2D

split-complementary

#173B8C #8C2D17 #768C17

monochromatic

#060F23 #0E2557 #173B8C #2051C1 #3E70DF

Accessibility & contrast

On white

10.29

#173B8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173B8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B8C

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B8C	#FFFFFF	#000000	##FFFFFF
##173B8C	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468F

Deuteranopia (green-blind)

#003B8A

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173b8c;
/* rgb */ color: rgb(23, 59, 140);
/* oklch */ color: oklch(38.0% 0.141 263.2);

Tailwind

colors: {
  custom: {
    50: '#6a70ae',
    500: '#173b8c',
    950: '#000000',
  },
}

SCSS

$custom: #173b8c;
$custom-light: #6a70ae;
$custom-dark: #000000;

JSON

{
  "hex": "#173b8c",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 140
  },
  "hsl": {
    "h": 221.538,
    "s": 71.779,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38023,
    "c": 0.14122,
    "h": 263.2
  },
  "luminance": 0.05204
}

Semantic roles & 50–950 ramp

primary

#173B8C

secondary

#BF983F

accent

#B739EF

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173B8C

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

Preview Lab → · Contrast checker → · Palette generator →