#173D78#173D78

#173D78 is a dark, moderate blue. Relative luminance 0.049; OKLCH L 36.8% C 0.110 H 259.1°. Best body text is #FFFFFF at 10.63:1 contrast (WCAG AA passes).

Color values

HEX	#173D78
RGB	rgb(23, 61, 120)
HSL	hsl(216, 68%, 28%)
HSV	hsv(216, 81%, 47%)
CMYK	cmyk(80.8%, 49.2%, 0%, 52.9%)
CIE-LAB	lab(26.38, 9.69, -37.55)
CIE-LCH	lch(26.38, 38.78, 284.47°)
OKLab	oklab(36.83% -0.0207 -0.1078)
OKLCH	oklch(36.83% 0.11 259.1)
XYZ	xyz(5.4110, 4.8751, 18.4215)
Luminance	0.0488 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D78 #785217

analogous

#176D78 #173D78 #221778

triadic

#173D78 #78173D #3D7817

tetradic

#173D78 #78176D #785217 #177822

square

#173D78 #78176D #785217 #177822

split-complementary

#173D78 #782217 #6D7817

monochromatic

#050D1A #0D2345 #173D78 #2157AB #3273D8

Accessibility & contrast

On white

10.63

#173D78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#173D78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D78

10.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D78	#FFFFFF	#000000	##FFFFFF
##173D78	1.00	10.63	1.98	10.63
#FFFFFF	10.63	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C437A

Deuteranopia (green-blind)

#023A77

Tritanopia (blue-blind)

#004B54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173d78;
/* rgb */ color: rgb(23, 61, 120);
/* oklch */ color: oklch(36.8% 0.110 259.1);

Tailwind

colors: {
  custom: {
    50: '#64719f',
    500: '#173d78',
    950: '#000000',
  },
}

SCSS

$custom: #173d78;
$custom-light: #64719f;
$custom-dark: #000000;

JSON

{
  "hex": "#173d78",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 120
  },
  "hsl": {
    "h": 216.495,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.36833,
    "c": 0.10981,
    "h": 259.1
  },
  "luminance": 0.04876
}

Semantic roles & 50–950 ramp

primary

#173D78

secondary

#AD813E

accent

#A73DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173D78

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

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