#173B59#173B59

#173B59 is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.067 H 246.6°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#173B59
RGB	rgb(23, 59, 89)
HSL	hsl(207, 59%, 22%)
HSV	hsv(207, 74%, 35%)
CMYK	cmyk(74.2%, 33.7%, 0%, 65.1%)
CIE-LAB	lab(23.77, -1.68, -21.75)
CIE-LCH	lch(23.77, 21.82, 265.58°)
OKLab	oklab(34.17% -0.0266 -0.0615)
OKLCH	oklch(34.17% 0.067 246.6)
XYZ	xyz(3.7198, 4.0310, 10.0313)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B59 #593517

analogous

#175956 #173B59 #171A59

triadic

#173B59 #59173B #3B5917

tetradic

#173B59 #561759 #593517 #1A5917

square

#173B59 #561759 #593517 #1A5917

split-complementary

#173B59 #59171A #595617

monochromatic

#061018 #0A1B28 #173B59 #245B8A #307BBA

Accessibility & contrast

On white

11.63

#173B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#173B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B59

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B59	#FFFFFF	#000000	##FFFFFF
##173B59	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3C5A

Deuteranopia (green-blind)

#243658

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173b59;
/* rgb */ color: rgb(23, 59, 89);
/* oklch */ color: oklch(34.2% 0.067 246.6);

Tailwind

colors: {
  custom: {
    50: '#5d7088',
    500: '#173b59',
    950: '#000000',
  },
}

SCSS

$custom: #173b59;
$custom-light: #5d7088;
$custom-dark: #000000;

JSON

{
  "hex": "#173b59",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 89
  },
  "hsl": {
    "h": 207.273,
    "s": 58.929,
    "l": 21.961
  },
  "oklch": {
    "l": 0.34173,
    "c": 0.06706,
    "h": 246.6
  },
  "luminance": 0.04031
}

Semantic roles & 50–950 ramp

primary

#173B59

secondary

#90623C

accent

#8D46E2

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173B59

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

Preview Lab → · Contrast checker → · Palette generator →