#173C78#173C78

#173C78 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.6% C 0.111 H 259.7°. Best body text is #FFFFFF at 10.75:1 contrast (WCAG AA passes).

Color values

HEX	#173C78
RGB	rgb(23, 60, 120)
HSL	hsl(217, 68%, 28%)
HSV	hsv(217, 81%, 47%)
CMYK	cmyk(80.8%, 50%, 0%, 52.9%)
CIE-LAB	lab(26.07, 10.39, -38.05)
CIE-LCH	lch(26.07, 39.45, 285.28°)
OKLab	oklab(36.6% -0.0198 -0.1093)
OKLCH	oklch(36.6% 0.111 259.7)
XYZ	xyz(5.3581, 4.7693, 18.4038)
Luminance	0.0477 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C78 #785317

analogous

#176C78 #173C78 #221778

triadic

#173C78 #78173C #3C7817

tetradic

#173C78 #78176C #785317 #177822

square

#173C78 #78176C #785317 #177822

split-complementary

#173C78 #782217 #6C7817

monochromatic

#050D1A #0D2245 #173C78 #2156AB #3271D8

Accessibility & contrast

On white

10.75

#173C78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#173C78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C78

10.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C78	#FFFFFF	#000000	##FFFFFF
##173C78	1.00	10.75	1.95	10.75
#FFFFFF	10.75	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A427A

Deuteranopia (green-blind)

#003A77

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173c78;
/* rgb */ color: rgb(23, 60, 120);
/* oklch */ color: oklch(36.6% 0.111 259.7);

Tailwind

colors: {
  custom: {
    50: '#64719f',
    500: '#173c78',
    950: '#000000',
  },
}

SCSS

$custom: #173c78;
$custom-light: #64719f;
$custom-dark: #000000;

JSON

{
  "hex": "#173c78",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 120
  },
  "hsl": {
    "h": 217.113,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.36595,
    "c": 0.11111,
    "h": 259.7
  },
  "luminance": 0.0477
}

Semantic roles & 50–950 ramp

primary

#173C78

secondary

#AD833E

accent

#A83DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173C78

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

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