#173C55#173C55

#173C55 is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.2% C 0.061 H 241.3°. Best body text is #FFFFFF at 11.58:1 contrast (WCAG AA passes).

Color values

HEX	#173C55
RGB	rgb(23, 60, 85)
HSL	hsl(204, 57%, 21%)
HSV	hsv(204, 73%, 33%)
CMYK	cmyk(72.9%, 29.4%, 0%, 66.7%)
CIE-LAB	lab(23.90, -3.94, -18.93)
CIE-LCH	lch(23.90, 19.34, 258.25°)
OKLab	oklab(34.2% -0.0292 -0.0533)
OKLCH	oklch(34.2% 0.061 241.3)
XYZ	xyz(3.6083, 4.0694, 9.1879)
Luminance	0.0407 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C55 #553017

analogous

#17554F #173C55 #171D55

triadic

#173C55 #55173C #3C5517

tetradic

#173C55 #4F1755 #553017 #1D5517

square

#173C55 #4F1755 #553017 #1D5517

split-complementary

#173C55 #55171D #554F17

monochromatic

#071118 #0A1A25 #173C55 #245E85 #3180B5

Accessibility & contrast

On white

11.58

#173C55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#173C55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C55

11.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C55	#FFFFFF	#000000	##FFFFFF
##173C55	1.00	11.58	1.81	11.58
#FFFFFF	11.58	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313C56

Deuteranopia (green-blind)

#283655

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173c55;
/* rgb */ color: rgb(23, 60, 85);
/* oklch */ color: oklch(34.2% 0.061 241.3);

Tailwind

colors: {
  custom: {
    50: '#5c7185',
    500: '#173c55',
    950: '#000000',
  },
}

SCSS

$custom: #173c55;
$custom-light: #5c7185;
$custom-dark: #000000;

JSON

{
  "hex": "#173c55",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 85
  },
  "hsl": {
    "h": 204.194,
    "s": 57.407,
    "l": 21.176
  },
  "oklch": {
    "l": 0.34202,
    "c": 0.06082,
    "h": 241.3
  },
  "luminance": 0.0407
}

Semantic roles & 50–950 ramp

primary

#173C55

secondary

#8C5C3C

accent

#8547E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #173C55

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

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