#173A83#173A83

#173A83 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.0% C 0.130 H 262.6°. Best body text is #FFFFFF at 10.66:1 contrast (WCAG AA passes).

Color values

HEX	#173A83
RGB	rgb(23, 58, 131)
HSL	hsl(221, 70%, 30%)
HSV	hsv(221, 82%, 51%)
CMYK	cmyk(82.4%, 55.7%, 0%, 48.6%)
CIE-LAB	lab(26.29, 16.37, -44.60)
CIE-LCH	lch(26.29, 47.51, 290.15°)
OKLab	oklab(37.03% -0.0167 -0.1286)
OKLCH	oklch(37.03% 0.13 262.6)
XYZ	xyz(5.9617, 4.8463, 22.0895)
Luminance	0.0485 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A83 #836017

analogous

#177083 #173A83 #2A1783

triadic

#173A83 #83173A #3A8317

tetradic

#173A83 #831770 #836017 #17832A

square

#173A83 #831770 #836017 #17832A

split-complementary

#173A83 #832A17 #708317

monochromatic

#050C1B #0E234F #173A83 #2051B7 #386DDC

Accessibility & contrast

On white

10.66

#173A83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#173A83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A83

10.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A83	#FFFFFF	#000000	##FFFFFF
##173A83	1.00	10.66	1.97	10.66
#FFFFFF	10.66	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004386

Deuteranopia (green-blind)

#003A82

Tritanopia (blue-blind)

#004C58

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173a83;
/* rgb */ color: rgb(23, 58, 131);
/* oklch */ color: oklch(37.0% 0.130 262.6);

Tailwind

colors: {
  custom: {
    50: '#676fa8',
    500: '#173a83',
    950: '#000000',
  },
}

SCSS

$custom: #173a83;
$custom-light: #676fa8;
$custom-dark: #000000;

JSON

{
  "hex": "#173a83",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 131
  },
  "hsl": {
    "h": 220.556,
    "s": 70.13,
    "l": 30.196
  },
  "oklch": {
    "l": 0.3703,
    "c": 0.12972,
    "h": 262.6
  },
  "luminance": 0.04847
}

Semantic roles & 50–950 ramp

primary

#173A83

secondary

#B7903F

accent

#B33BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173A83

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

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