#173F83#173F83

#173F83 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.2% C 0.123 H 260.4°. Best body text is #FFFFFF at 10.12:1 contrast (WCAG AA passes).

Color values

HEX	#173F83
RGB	rgb(23, 63, 131)
HSL	hsl(218, 70%, 30%)
HSV	hsv(218, 82%, 51%)
CMYK	cmyk(82.4%, 51.9%, 0%, 48.6%)
CIE-LAB	lab(27.78, 12.86, -42.20)
CIE-LCH	lch(27.78, 44.11, 286.95°)
OKLab	oklab(38.16% -0.0206 -0.1215)
OKLCH	oklch(38.16% 0.123 260.4)
XYZ	xyz(6.2261, 5.3751, 22.1777)
Luminance	0.0538 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F83 #835B17

analogous

#177583 #173F83 #251783

triadic

#173F83 #83173F #3F8317

tetradic

#173F83 #831775 #835B17 #178325

square

#173F83 #831775 #835B17 #178325

split-complementary

#173F83 #832517 #758317

monochromatic

#050D1B #0E264F #173F83 #2058B7 #3875DC

Accessibility & contrast

On white

10.12

#173F83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#173F83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F83

10.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F83	#FFFFFF	#000000	##FFFFFF
##173F83	1.00	10.12	2.08	10.12
#FFFFFF	10.12	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#144785

Deuteranopia (green-blind)

#003D82

Tritanopia (blue-blind)

#004F5A

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173f83;
/* rgb */ color: rgb(23, 63, 131);
/* oklch */ color: oklch(38.2% 0.123 260.4);

Tailwind

colors: {
  custom: {
    50: '#6773a8',
    500: '#173f83',
    950: '#000000',
  },
}

SCSS

$custom: #173f83;
$custom-light: #6773a8;
$custom-dark: #000000;

JSON

{
  "hex": "#173f83",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 131
  },
  "hsl": {
    "h": 217.778,
    "s": 70.13,
    "l": 30.196
  },
  "oklch": {
    "l": 0.38161,
    "c": 0.12319,
    "h": 260.4
  },
  "luminance": 0.05376
}

Semantic roles & 50–950 ramp

primary

#173F83

secondary

#B78B3F

accent

#AB3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F83

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

Preview Lab → · Contrast checker → · Palette generator →