#173B83#173B83

#173B83 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.3% C 0.128 H 262.2°. Best body text is #FFFFFF at 10.55:1 contrast (WCAG AA passes).

Color values

HEX	#173B83
RGB	rgb(23, 59, 131)
HSL	hsl(220, 70%, 30%)
HSV	hsv(220, 82%, 51%)
CMYK	cmyk(82.4%, 55%, 0%, 48.6%)
CIE-LAB	lab(26.59, 15.66, -44.12)
CIE-LCH	lch(26.59, 46.82, 289.54°)
OKLab	oklab(37.25% -0.0175 -0.1272)
OKLCH	oklch(37.25% 0.128 262.2)
XYZ	xyz(6.0126, 4.9481, 22.1065)
Luminance	0.0495 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B83 #835F17

analogous

#177183 #173B83 #291783

triadic

#173B83 #83173B #3B8317

tetradic

#173B83 #831771 #835F17 #178329

square

#173B83 #831771 #835F17 #178329

split-complementary

#173B83 #832917 #718317

monochromatic

#050C1B #0E244F #173B83 #2052B7 #386FDC

Accessibility & contrast

On white

10.55

#173B83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#173B83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B83

10.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B83	#FFFFFF	#000000	##FFFFFF
##173B83	1.00	10.55	1.99	10.55
#FFFFFF	10.55	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#034486

Deuteranopia (green-blind)

#003A82

Tritanopia (blue-blind)

#004D59

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173b83;
/* rgb */ color: rgb(23, 59, 131);
/* oklch */ color: oklch(37.3% 0.128 262.2);

Tailwind

colors: {
  custom: {
    50: '#6770a8',
    500: '#173b83',
    950: '#000000',
  },
}

SCSS

$custom: #173b83;
$custom-light: #6770a8;
$custom-dark: #000000;

JSON

{
  "hex": "#173b83",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 131
  },
  "hsl": {
    "h": 220,
    "s": 70.13,
    "l": 30.196
  },
  "oklch": {
    "l": 0.37253,
    "c": 0.12842,
    "h": 262.2
  },
  "luminance": 0.04949
}

Semantic roles & 50–950 ramp

primary

#173B83

secondary

#B78F3F

accent

#B23BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173B83

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

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