#173F84#173F84

#173F84 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.2% C 0.125 H 260.6°. Best body text is #FFFFFF at 10.09:1 contrast (WCAG AA passes).

Color values

HEX	#173F84
RGB	rgb(23, 63, 132)
HSL	hsl(218, 70%, 30%)
HSV	hsv(218, 83%, 52%)
CMYK	cmyk(82.6%, 52.3%, 0%, 48.2%)
CIE-LAB	lab(27.85, 13.27, -42.70)
CIE-LCH	lch(27.85, 44.71, 287.27°)
OKLab	oklab(38.24% -0.0205 -0.1229)
OKLCH	oklch(38.24% 0.125 260.6)
XYZ	xyz(6.2942, 5.4024, 22.5363)
Luminance	0.0540 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F84 #845C17

analogous

#177584 #173F84 #261784

triadic

#173F84 #84173F #3F8417

tetradic

#173F84 #841775 #845C17 #178426

square

#173F84 #841775 #845C17 #178426

split-complementary

#173F84 #842617 #758417

monochromatic

#050D1C #0E2650 #173F84 #2058B8 #3975DC

Accessibility & contrast

On white

10.09

#173F84 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#173F84 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F84

10.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F84	#FFFFFF	#000000	##FFFFFF
##173F84	1.00	10.09	2.08	10.09
#FFFFFF	10.09	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#134786

Deuteranopia (green-blind)

#003D83

Tritanopia (blue-blind)

#00505B

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173f84;
/* rgb */ color: rgb(23, 63, 132);
/* oklch */ color: oklch(38.2% 0.125 260.6);

Tailwind

colors: {
  custom: {
    50: '#6773a8',
    500: '#173f84',
    950: '#000000',
  },
}

SCSS

$custom: #173f84;
$custom-light: #6773a8;
$custom-dark: #000000;

JSON

{
  "hex": "#173f84",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 132
  },
  "hsl": {
    "h": 217.982,
    "s": 70.323,
    "l": 30.392
  },
  "oklch": {
    "l": 0.38241,
    "c": 0.12463,
    "h": 260.6
  },
  "luminance": 0.05403
}

Semantic roles & 50–950 ramp

primary

#173F84

secondary

#B88C3F

accent

#AC3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173F84

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

Preview Lab → · Contrast checker → · Palette generator →