#173C79#173C79

#173C79 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.7% C 0.113 H 259.9°. Best body text is #FFFFFF at 10.72:1 contrast (WCAG AA passes).

Color values

HEX	#173C79
RGB	rgb(23, 60, 121)
HSL	hsl(217, 68%, 28%)
HSV	hsv(217, 81%, 47%)
CMYK	cmyk(81%, 50.4%, 0%, 52.5%)
CIE-LAB	lab(26.14, 10.81, -38.57)
CIE-LCH	lch(26.14, 40.05, 285.66°)
OKLab	oklab(36.67% -0.0196 -0.1108)
OKLCH	oklch(36.67% 0.113 259.9)
XYZ	xyz(5.4191, 4.7937, 18.7251)
Luminance	0.0479 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C79 #795417

analogous

#176D79 #173C79 #231779

triadic

#173C79 #79173C #3C7917

tetradic

#173C79 #79176D #795417 #177923

square

#173C79 #79176D #795417 #177923

split-complementary

#173C79 #792317 #6D7917

monochromatic

#050D1A #0D2246 #173C79 #2155AC #3271D8

Accessibility & contrast

On white

10.72

#173C79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#173C79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C79

10.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C79	#FFFFFF	#000000	##FFFFFF
##173C79	1.00	10.72	1.96	10.72
#FFFFFF	10.72	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#19437B

Deuteranopia (green-blind)

#003A78

Tritanopia (blue-blind)

#004B54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173c79;
/* rgb */ color: rgb(23, 60, 121);
/* oklch */ color: oklch(36.7% 0.113 259.9);

Tailwind

colors: {
  custom: {
    50: '#6571a0',
    500: '#173c79',
    950: '#000000',
  },
}

SCSS

$custom: #173c79;
$custom-light: #6571a0;
$custom-dark: #000000;

JSON

{
  "hex": "#173c79",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 121
  },
  "hsl": {
    "h": 217.347,
    "s": 68.056,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36673,
    "c": 0.11258,
    "h": 259.9
  },
  "luminance": 0.04794
}

Semantic roles & 50–950 ramp

primary

#173C79

secondary

#AE843E

accent

#A93DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070F

muted

#7A7A7E

Preview Lab

Preview with #173C79

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

Preview Lab → · Contrast checker → · Palette generator →