#173F78#173F78

#173F78 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.3% C 0.107 H 257.9°. Best body text is #FFFFFF at 10.40:1 contrast (WCAG AA passes).

Color values

HEX	#173F78
RGB	rgb(23, 63, 120)
HSL	hsl(215, 68%, 28%)
HSV	hsv(215, 81%, 47%)
CMYK	cmyk(80.8%, 47.5%, 0%, 52.9%)
CIE-LAB	lab(27.00, 8.29, -36.56)
CIE-LCH	lch(27.00, 37.49, 282.78°)
OKLab	oklab(37.31% -0.0225 -0.1049)
OKLCH	oklch(37.31% 0.107 257.9)
XYZ	xyz(5.5198, 5.0926, 18.4577)
Luminance	0.0509 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F78 #785017

analogous

#176F78 #173F78 #201778

triadic

#173F78 #78173F #3F7817

tetradic

#173F78 #78176F #785017 #177820

square

#173F78 #78176F #785017 #177820

split-complementary

#173F78 #782017 #6F7817

monochromatic

#050D1A #0D2445 #173F78 #215AAB #3276D8

Accessibility & contrast

On white

10.40

#173F78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173F78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F78

10.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F78	#FFFFFF	#000000	##FFFFFF
##173F78	1.00	10.40	2.02	10.40
#FFFFFF	10.40	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#21457A

Deuteranopia (green-blind)

#0A3C77

Tritanopia (blue-blind)

#004D55

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173f78;
/* rgb */ color: rgb(23, 63, 120);
/* oklch */ color: oklch(37.3% 0.107 257.9);

Tailwind

colors: {
  custom: {
    50: '#64739f',
    500: '#173f78',
    950: '#000000',
  },
}

SCSS

$custom: #173f78;
$custom-light: #64739f;
$custom-dark: #000000;

JSON

{
  "hex": "#173f78",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 120
  },
  "hsl": {
    "h": 215.258,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.37311,
    "c": 0.10724,
    "h": 257.9
  },
  "luminance": 0.05093
}

Semantic roles & 50–950 ramp

primary

#173F78

secondary

#AD7F3E

accent

#A33DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #173F78

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

Preview Lab → · Contrast checker → · Palette generator →