#173F87#173F87

#173F87 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.5% C 0.129 H 261.0°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#173F87
RGB	rgb(23, 63, 135)
HSL	hsl(219, 71%, 31%)
HSV	hsv(219, 83%, 53%)
CMYK	cmyk(83%, 53.3%, 0%, 47.1%)
CIE-LAB	lab(28.08, 14.51, -44.20)
CIE-LCH	lch(28.08, 46.52, 288.18°)
OKLab	oklab(38.48% -0.0201 -0.1274)
OKLCH	oklch(38.48% 0.129 261)
XYZ	xyz(6.5024, 5.4857, 23.6331)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F87 #875F17

analogous

#177787 #173F87 #271787

triadic

#173F87 #87173F #3F8717

tetradic

#173F87 #871777 #875F17 #178727

square

#173F87 #871777 #875F17 #178727

split-complementary

#173F87 #872717 #778717

monochromatic

#050E1E #0E2753 #173F87 #2057BB #3B75DE

Accessibility & contrast

On white

10.01

#173F87 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#173F87 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F87

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F87	#FFFFFF	#000000	##FFFFFF
##173F87	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D488A

Deuteranopia (green-blind)

#003D86

Tritanopia (blue-blind)

#00515C

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173f87;
/* rgb */ color: rgb(23, 63, 135);
/* oklch */ color: oklch(38.5% 0.129 261.0);

Tailwind

colors: {
  custom: {
    50: '#6873aa',
    500: '#173f87',
    950: '#000000',
  },
}

SCSS

$custom: #173f87;
$custom-light: #6873aa;
$custom-dark: #000000;

JSON

{
  "hex": "#173f87",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 135
  },
  "hsl": {
    "h": 218.571,
    "s": 70.886,
    "l": 30.98
  },
  "oklch": {
    "l": 0.38484,
    "c": 0.12893,
    "h": 261
  },
  "luminance": 0.05486
}

Semantic roles & 50–950 ramp

primary

#173F87

secondary

#BB8F3F

accent

#AE3AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173F87

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

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