#173D8F#173D8F

#173D8F is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.7% C 0.143 H 262.8°. Best body text is #FFFFFF at 10.00:1 contrast (WCAG AA passes).

Color values

HEX	#173D8F
RGB	rgb(23, 61, 143)
HSL	hsl(221, 72%, 33%)
HSV	hsv(221, 84%, 56%)
CMYK	cmyk(83.9%, 57.3%, 0%, 43.9%)
CIE-LAB	lab(28.12, 19.19, -49.08)
CIE-LCH	lch(28.12, 52.70, 291.36°)
OKLab	oklab(38.71% -0.0178 -0.1417)
OKLCH	oklch(38.71% 0.143 262.8)
XYZ	xyz(6.9782, 5.5020, 26.6755)
Luminance	0.0550 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8F #8F6917

analogous

#17798F #173D8F #2D178F

triadic

#173D8F #8F173D #3D8F17

tetradic

#173D8F #8F1779 #8F6917 #178F2D

square

#173D8F #8F1779 #8F6917 #178F2D

split-complementary

#173D8F #8F2D17 #798F17

monochromatic

#061026 #0F275A #173D8F #1F53C4 #4073E0

Accessibility & contrast

On white

10.00

#173D8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#173D8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8F

10.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8F	#FFFFFF	#000000	##FFFFFF
##173D8F	1.00	10.00	2.10	10.00
#FFFFFF	10.00	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003D8D

Tritanopia (blue-blind)

#005160

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173d8f;
/* rgb */ color: rgb(23, 61, 143);
/* oklch */ color: oklch(38.7% 0.143 262.8);

Tailwind

colors: {
  custom: {
    50: '#6a71b0',
    500: '#173d8f',
    950: '#000000',
  },
}

SCSS

$custom: #173d8f;
$custom-light: #6a71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8f",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 143
  },
  "hsl": {
    "h": 221,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38714,
    "c": 0.14285,
    "h": 262.8
  },
  "luminance": 0.05503
}

Semantic roles & 50–950 ramp

primary

#173D8F

secondary

#C19841

accent

#B539EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080711

muted

#7A7A80

Preview Lab

Preview with #173D8F

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

Preview Lab → · Contrast checker → · Palette generator →