#173F59#173F59

#173F59 is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.2% C 0.064 H 240.5°. Best body text is #FFFFFF at 11.10:1 contrast (WCAG AA passes).

Color values

HEX	#173F59
RGB	rgb(23, 63, 89)
HSL	hsl(204, 59%, 22%)
HSV	hsv(204, 74%, 35%)
CMYK	cmyk(74.2%, 29.2%, 0%, 65.1%)
CIE-LAB	lab(25.13, -4.34, -19.63)
CIE-LCH	lch(25.13, 20.10, 257.52°)
OKLab	oklab(35.25% -0.0312 -0.0553)
OKLCH	oklch(35.25% 0.064 240.5)
XYZ	xyz(3.9333, 4.4580, 10.1024)
Luminance	0.0446 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F59 #593117

analogous

#175952 #173F59 #171E59

triadic

#173F59 #59173F #3F5917

tetradic

#173F59 #521759 #593117 #1E5917

square

#173F59 #521759 #593117 #1E5917

split-complementary

#173F59 #59171E #595217

monochromatic

#061118 #0A1D28 #173F59 #24618A #3084BA

Accessibility & contrast

On white

11.10

#173F59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#173F59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F59

11.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F59	#FFFFFF	#000000	##FFFFFF
##173F59	1.00	11.10	1.89	11.10
#FFFFFF	11.10	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333F5A

Deuteranopia (green-blind)

#2A3959

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173f59;
/* rgb */ color: rgb(23, 63, 89);
/* oklch */ color: oklch(35.2% 0.064 240.5);

Tailwind

colors: {
  custom: {
    50: '#5d7388',
    500: '#173f59',
    950: '#000000',
  },
}

SCSS

$custom: #173f59;
$custom-light: #5d7388;
$custom-dark: #000000;

JSON

{
  "hex": "#173f59",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 89
  },
  "hsl": {
    "h": 203.636,
    "s": 58.929,
    "l": 21.961
  },
  "oklch": {
    "l": 0.35246,
    "c": 0.06355,
    "h": 240.5
  },
  "luminance": 0.04458
}

Semantic roles & 50–950 ramp

primary

#173F59

secondary

#905D3C

accent

#8346E2

background

#F5F7F8

surface

#E9EDEF

border

#C5C8CA

text

#05080B

muted

#797B7C

Preview Lab

Preview with #173F59

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

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