#173C8D#173C8D

#173C8D is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.141 H 263.0°. Best body text is #FFFFFF at 10.16:1 contrast (WCAG AA passes).

Color values

HEX	#173C8D
RGB	rgb(23, 60, 141)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 55%)
CMYK	cmyk(83.7%, 57.4%, 0%, 44.7%)
CIE-LAB	lab(27.67, 19.08, -48.57)
CIE-LCH	lch(27.67, 52.18, 291.44°)
OKLab	oklab(38.32% -0.0173 -0.1403)
OKLCH	oklch(38.32% 0.141 263)
XYZ	xyz(6.7752, 5.3361, 25.8670)
Luminance	0.0534 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C8D #8D6817

analogous

#17778D #173C8D #2D178D

triadic

#173C8D #8D173C #3C8D17

tetradic

#173C8D #8D1777 #8D6817 #178D2D

square

#173C8D #8D1777 #8D6817 #178D2D

split-complementary

#173C8D #8D2D17 #778D17

monochromatic

#060F24 #0E2658 #173C8D #2052C2 #3F71E0

Accessibility & contrast

On white

10.16

#173C8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#173C8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C8D

10.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C8D	#FFFFFF	#000000	##FFFFFF
##173C8D	1.00	10.16	2.07	10.16
#FFFFFF	10.16	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004790

Deuteranopia (green-blind)

#003C8B

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173c8d;
/* rgb */ color: rgb(23, 60, 141);
/* oklch */ color: oklch(38.3% 0.141 263.0);

Tailwind

colors: {
  custom: {
    50: '#6a71af',
    500: '#173c8d',
    950: '#000000',
  },
}

SCSS

$custom: #173c8d;
$custom-light: #6a71af;
$custom-dark: #000000;

JSON

{
  "hex": "#173c8d",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 141
  },
  "hsl": {
    "h": 221.186,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.38325,
    "c": 0.14133,
    "h": 263
  },
  "luminance": 0.05337
}

Semantic roles & 50–950 ramp

primary

#173C8D

secondary

#C09840

accent

#B639EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173C8D

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

Preview Lab → · Contrast checker → · Palette generator →