#173F89#173F89

#173F89 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.132 H 261.4°. Best body text is #FFFFFF at 9.96:1 contrast (WCAG AA passes).

Color values

HEX	#173F89
RGB	rgb(23, 63, 137)
HSL	hsl(219, 71%, 31%)
HSV	hsv(219, 83%, 54%)
CMYK	cmyk(83.2%, 54%, 0%, 46.3%)
CIE-LAB	lab(28.23, 15.34, -45.20)
CIE-LCH	lch(28.23, 47.73, 288.75°)
OKLab	oklab(38.65% -0.0198 -0.1303)
OKLCH	oklch(38.65% 0.132 261.4)
XYZ	xyz(6.6446, 5.5425, 24.3817)
Luminance	0.0554 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F89 #896117

analogous

#177889 #173F89 #281789

triadic

#173F89 #89173F #3F8917

tetradic

#173F89 #891778 #896117 #178928

square

#173F89 #891778 #896117 #178928

split-complementary

#173F89 #892817 #788917

monochromatic

#050F20 #0E2755 #173F89 #2057BD #3C75DE

Accessibility & contrast

On white

9.96

#173F89 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#173F89 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F89

9.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F89	#FFFFFF	#000000	##FFFFFF
##173F89	1.00	9.96	2.11	9.96
#FFFFFF	9.96	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#08488C

Deuteranopia (green-blind)

#003E88

Tritanopia (blue-blind)

#00515D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #173f89;
/* rgb */ color: rgb(23, 63, 137);
/* oklch */ color: oklch(38.6% 0.132 261.4);

Tailwind

colors: {
  custom: {
    50: '#6973ac',
    500: '#173f89',
    950: '#000000',
  },
}

SCSS

$custom: #173f89;
$custom-light: #6973ac;
$custom-dark: #000000;

JSON

{
  "hex": "#173f89",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 137
  },
  "hsl": {
    "h": 218.947,
    "s": 71.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.38648,
    "c": 0.13179,
    "h": 261.4
  },
  "luminance": 0.05543
}

Semantic roles & 50–950 ramp

primary

#173F89

secondary

#BD913F

accent

#AF3AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173F89

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

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