#173C5A#173C5A

#173C5A is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.5% C 0.067 H 246.0°. Best body text is #FFFFFF at 11.47:1 contrast (WCAG AA passes).

Color values

HEX	#173C5A
RGB	rgb(23, 60, 90)
HSL	hsl(207, 59%, 22%)
HSV	hsv(207, 74%, 35%)
CMYK	cmyk(74.4%, 33.3%, 0%, 64.7%)
CIE-LAB	lab(24.17, -1.95, -21.79)
CIE-LCH	lch(24.17, 21.88, 264.88°)
OKLab	oklab(34.5% -0.0274 -0.0616)
OKLCH	oklch(34.5% 0.067 246)
XYZ	xyz(3.8140, 4.1517, 10.2712)
Luminance	0.0415 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C5A #5A3517

analogous

#175A57 #173C5A #171A5A

triadic

#173C5A #5A173C #3C5A17

tetradic

#173C5A #57175A #5A3517 #1A5A17

square

#173C5A #57175A #5A3517 #1A5A17

split-complementary

#173C5A #5A171A #5A5717

monochromatic

#061018 #0B1C29 #173C5A #235C8B #307DBB

Accessibility & contrast

On white

11.47

#173C5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#173C5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C5A

11.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C5A	#FFFFFF	#000000	##FFFFFF
##173C5A	1.00	11.47	1.83	11.47
#FFFFFF	11.47	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3D5B

Deuteranopia (green-blind)

#253759

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173c5a;
/* rgb */ color: rgb(23, 60, 90);
/* oklch */ color: oklch(34.5% 0.067 246.0);

Tailwind

colors: {
  custom: {
    50: '#5d7189',
    500: '#173c5a',
    950: '#000000',
  },
}

SCSS

$custom: #173c5a;
$custom-light: #5d7189;
$custom-dark: #000000;

JSON

{
  "hex": "#173c5a",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 90
  },
  "hsl": {
    "h": 206.866,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.34501,
    "c": 0.06747,
    "h": 246
  },
  "luminance": 0.04152
}

Semantic roles & 50–950 ramp

primary

#173C5A

secondary

#91623C

accent

#8C45E2

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173C5A

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

Preview Lab → · Contrast checker → · Palette generator →