#173C8C#173C8C

#173C8C is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.2% C 0.140 H 262.9°. Best body text is #FFFFFF at 10.19:1 contrast (WCAG AA passes).

Color values

HEX	#173C8C
RGB	rgb(23, 60, 140)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 55%)
CMYK	cmyk(83.6%, 57.1%, 0%, 45.1%)
CIE-LAB	lab(27.59, 18.67, -48.09)
CIE-LCH	lch(27.59, 51.58, 291.21°)
OKLab	oklab(38.24% -0.0174 -0.1388)
OKLCH	oklch(38.24% 0.14 262.9)
XYZ	xyz(6.7011, 5.3065, 25.4769)
Luminance	0.0531 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C8C #8C6717

analogous

#17778C #173C8C #2D178C

triadic

#173C8C #8C173C #3C8C17

tetradic

#173C8C #8C1777 #8C6717 #178C2D

square

#173C8C #8C1777 #8C6717 #178C2D

split-complementary

#173C8C #8C2D17 #778C17

monochromatic

#060F23 #0E2557 #173C8C #2053C1 #3E71DF

Accessibility & contrast

On white

10.19

#173C8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173C8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C8C

10.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C8C	#FFFFFF	#000000	##FFFFFF
##173C8C	1.00	10.19	2.06	10.19
#FFFFFF	10.19	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478F

Deuteranopia (green-blind)

#003C8A

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173c8c;
/* rgb */ color: rgb(23, 60, 140);
/* oklch */ color: oklch(38.2% 0.140 262.9);

Tailwind

colors: {
  custom: {
    50: '#6a71ae',
    500: '#173c8c',
    950: '#000000',
  },
}

SCSS

$custom: #173c8c;
$custom-light: #6a71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#173c8c",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 140
  },
  "hsl": {
    "h": 221.026,
    "s": 71.779,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38239,
    "c": 0.13992,
    "h": 262.9
  },
  "luminance": 0.05307
}

Semantic roles & 50–950 ramp

primary

#173C8C

secondary

#BF973F

accent

#B539EF

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173C8C

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

Preview Lab → · Contrast checker → · Palette generator →