#173F88#173F88

#173F88 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.130 H 261.2°. Best body text is #FFFFFF at 9.99:1 contrast (WCAG AA passes).

Color values

HEX	#173F88
RGB	rgb(23, 63, 136)
HSL	hsl(219, 71%, 31%)
HSV	hsv(219, 83%, 53%)
CMYK	cmyk(83.1%, 53.7%, 0%, 46.7%)
CIE-LAB	lab(28.15, 14.93, -44.70)
CIE-LCH	lch(28.15, 47.12, 288.46°)
OKLab	oklab(38.57% -0.0199 -0.1288)
OKLCH	oklch(38.57% 0.13 261.2)
XYZ	xyz(6.5732, 5.5140, 24.0056)
Luminance	0.0551 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F88 #886017

analogous

#177788 #173F88 #271788

triadic

#173F88 #88173F #3F8817

tetradic

#173F88 #881777 #886017 #178827

square

#173F88 #881777 #886017 #178827

split-complementary

#173F88 #882717 #778817

monochromatic

#050F1F #0E2754 #173F88 #2057BC #3B75DE

Accessibility & contrast

On white

9.99

#173F88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#173F88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F88

9.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F88	#FFFFFF	#000000	##FFFFFF
##173F88	1.00	9.99	2.10	9.99
#FFFFFF	9.99	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	9.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A488B

Deuteranopia (green-blind)

#003E87

Tritanopia (blue-blind)

#00515D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173f88;
/* rgb */ color: rgb(23, 63, 136);
/* oklch */ color: oklch(38.6% 0.130 261.2);

Tailwind

colors: {
  custom: {
    50: '#6873ab',
    500: '#173f88',
    950: '#000000',
  },
}

SCSS

$custom: #173f88;
$custom-light: #6873ab;
$custom-dark: #000000;

JSON

{
  "hex": "#173f88",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 136
  },
  "hsl": {
    "h": 218.761,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.38565,
    "c": 0.13036,
    "h": 261.2
  },
  "luminance": 0.05515
}

Semantic roles & 50–950 ramp

primary

#173F88

secondary

#BC903F

accent

#AE3AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173F88

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

Preview Lab → · Contrast checker → · Palette generator →