#173583#173583

#173583 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 35.9% C 0.136 H 264.5°. Best body text is #FFFFFF at 11.21:1 contrast (WCAG AA passes).

Color values

HEX	#173583
RGB	rgb(23, 53, 131)
HSL	hsl(223, 70%, 30%)
HSV	hsv(223, 82%, 51%)
CMYK	cmyk(82.4%, 59.5%, 0%, 48.6%)
CIE-LAB	lab(24.85, 19.89, -46.95)
CIE-LCH	lch(24.85, 50.99, 292.96°)
OKLab	oklab(35.94% -0.0131 -0.1356)
OKLCH	oklch(35.94% 0.136 264.5)
XYZ	xyz(5.7217, 4.3664, 22.0096)
Luminance	0.0437 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173583 #836517

analogous

#176B83 #173583 #2F1783

triadic

#173583 #831735 #358317

tetradic

#173583 #83176B #836517 #17832F

square

#173583 #83176B #836517 #17832F

split-complementary

#173583 #832F17 #6B8317

monochromatic

#050B1B #0E204F #173583 #204AB7 #3866DC

Accessibility & contrast

On white

11.21

#173583 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#173583 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173583

11.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173583	#FFFFFF	#000000	##FFFFFF
##173583	1.00	11.21	1.87	11.21
#FFFFFF	11.21	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004086

Deuteranopia (green-blind)

#003681

Tritanopia (blue-blind)

#004956

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #173583;
/* rgb */ color: rgb(23, 53, 131);
/* oklch */ color: oklch(35.9% 0.136 264.5);

Tailwind

colors: {
  custom: {
    50: '#686ba8',
    500: '#173583',
    950: '#000000',
  },
}

SCSS

$custom: #173583;
$custom-light: #686ba8;
$custom-dark: #000000;

JSON

{
  "hex": "#173583",
  "rgb": {
    "r": 23,
    "g": 53,
    "b": 131
  },
  "hsl": {
    "h": 223.333,
    "s": 70.13,
    "l": 30.196
  },
  "oklch": {
    "l": 0.3594,
    "c": 0.13627,
    "h": 264.5
  },
  "luminance": 0.04367
}

Semantic roles & 50–950 ramp

primary

#173583

secondary

#B7963F

accent

#BB3BED

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #173583

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

Preview Lab → · Contrast checker → · Palette generator →