#173E8F#173E8F

#173E8F is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.9% C 0.142 H 262.5°. Best body text is #FFFFFF at 9.90:1 contrast (WCAG AA passes).

Color values

HEX	#173E8F
RGB	rgb(23, 62, 143)
HSL	hsl(221, 72%, 33%)
HSV	hsv(221, 84%, 56%)
CMYK	cmyk(83.9%, 56.6%, 0%, 43.9%)
CIE-LAB	lab(28.41, 18.50, -48.61)
CIE-LCH	lch(28.41, 52.01, 290.83°)
OKLab	oklab(38.93% -0.0185 -0.1403)
OKLCH	oklch(38.93% 0.142 262.5)
XYZ	xyz(7.0321, 5.6097, 26.6934)
Luminance	0.0561 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173E8F #8F6817

analogous

#177A8F #173E8F #2C178F

triadic

#173E8F #8F173E #3E8F17

tetradic

#173E8F #8F177A #8F6817 #178F2C

square

#173E8F #8F177A #8F6817 #178F2C

split-complementary

#173E8F #8F2C17 #7A8F17

monochromatic

#061026 #0F275A #173E8F #1F55C4 #4074E0

Accessibility & contrast

On white

9.90

#173E8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#173E8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173E8F

9.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173E8F	#FFFFFF	#000000	##FFFFFF
##173E8F	1.00	9.90	2.12	9.90
#FFFFFF	9.90	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004992

Deuteranopia (green-blind)

#003E8D

Tritanopia (blue-blind)

#005260

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #173e8f;
/* rgb */ color: rgb(23, 62, 143);
/* oklch */ color: oklch(38.9% 0.142 262.5);

Tailwind

colors: {
  custom: {
    50: '#6a72b0',
    500: '#173e8f',
    950: '#000000',
  },
}

SCSS

$custom: #173e8f;
$custom-light: #6a72b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173e8f",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 143
  },
  "hsl": {
    "h": 220.5,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38931,
    "c": 0.14156,
    "h": 262.5
  },
  "luminance": 0.05611
}

Semantic roles & 50–950 ramp

primary

#173E8F

secondary

#C19741

accent

#B439EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080811

muted

#7A7B80

Preview Lab

Preview with #173E8F

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

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