#173A88#173A88

#173A88 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.5% C 0.137 H 263.2°. Best body text is #FFFFFF at 10.51:1 contrast (WCAG AA passes).

Color values

HEX	#173A88
RGB	rgb(23, 58, 136)
HSL	hsl(221, 71%, 31%)
HSV	hsv(221, 83%, 53%)
CMYK	cmyk(83.1%, 57.4%, 0%, 46.7%)
CIE-LAB	lab(26.69, 18.43, -47.07)
CIE-LCH	lch(26.69, 50.55, 291.38°)
OKLab	oklab(37.46% -0.0163 -0.1359)
OKLCH	oklch(37.46% 0.137 263.2)
XYZ	xyz(6.3087, 4.9851, 23.9175)
Luminance	0.0499 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A88 #886517

analogous

#177288 #173A88 #2C1788

triadic

#173A88 #88173A #3A8817

tetradic

#173A88 #881772 #886517 #17882C

square

#173A88 #881772 #886517 #17882C

split-complementary

#173A88 #882C17 #728817

monochromatic

#050D1F #0E2454 #173A88 #2050BC #3B6EDE

Accessibility & contrast

On white

10.51

#173A88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#173A88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A88

10.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A88	#FFFFFF	#000000	##FFFFFF
##173A88	1.00	10.51	2.00	10.51
#FFFFFF	10.51	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458B

Deuteranopia (green-blind)

#003A86

Tritanopia (blue-blind)

#004D5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173a88;
/* rgb */ color: rgb(23, 58, 136);
/* oklch */ color: oklch(37.5% 0.137 263.2);

Tailwind

colors: {
  custom: {
    50: '#696fab',
    500: '#173a88',
    950: '#000000',
  },
}

SCSS

$custom: #173a88;
$custom-light: #696fab;
$custom-dark: #000000;

JSON

{
  "hex": "#173a88",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 136
  },
  "hsl": {
    "h": 221.416,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.37458,
    "c": 0.13686,
    "h": 263.2
  },
  "luminance": 0.04986
}

Semantic roles & 50–950 ramp

primary

#173A88

secondary

#BC953F

accent

#B63AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173A88

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

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