#173C59#173C59

#173C59 is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.4% C 0.066 H 245.2°. Best body text is #FFFFFF at 11.49:1 contrast (WCAG AA passes).

Color values

HEX	#173C59
RGB	rgb(23, 60, 89)
HSL	hsl(206, 59%, 22%)
HSV	hsv(206, 74%, 35%)
CMYK	cmyk(74.2%, 32.6%, 0%, 65.1%)
CIE-LAB	lab(24.11, -2.35, -21.22)
CIE-LCH	lch(24.11, 21.35, 263.68°)
OKLab	oklab(34.44% -0.0278 -0.06)
OKLCH	oklch(34.44% 0.066 245.2)
XYZ	xyz(3.7717, 4.1347, 10.0486)
Luminance	0.0413 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C59 #593417

analogous

#175955 #173C59 #171B59

triadic

#173C59 #59173C #3C5917

tetradic

#173C59 #551759 #593417 #1B5917

square

#173C59 #551759 #593417 #1B5917

split-complementary

#173C59 #59171B #595517

monochromatic

#061018 #0A1B28 #173C59 #245D8A #307EBA

Accessibility & contrast

On white

11.49

#173C59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#173C59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C59

11.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C59	#FFFFFF	#000000	##FFFFFF
##173C59	1.00	11.49	1.83	11.49
#FFFFFF	11.49	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3D5A

Deuteranopia (green-blind)

#263658

Tritanopia (blue-blind)

#004346

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173c59;
/* rgb */ color: rgb(23, 60, 89);
/* oklch */ color: oklch(34.4% 0.066 245.2);

Tailwind

colors: {
  custom: {
    50: '#5d7188',
    500: '#173c59',
    950: '#000000',
  },
}

SCSS

$custom: #173c59;
$custom-light: #5d7188;
$custom-dark: #000000;

JSON

{
  "hex": "#173c59",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 89
  },
  "hsl": {
    "h": 206.364,
    "s": 58.929,
    "l": 21.961
  },
  "oklch": {
    "l": 0.3444,
    "c": 0.0661,
    "h": 245.2
  },
  "luminance": 0.04135
}

Semantic roles & 50–950 ramp

primary

#173C59

secondary

#90613C

accent

#8A46E2

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173C59

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

Preview Lab → · Contrast checker → · Palette generator →