#173F5A#173F5A

#173F5A is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.3% C 0.065 H 241.6°. Best body text is #FFFFFF at 11.08:1 contrast (WCAG AA passes).

Color values

HEX	#173F5A
RGB	rgb(23, 63, 90)
HSL	hsl(204, 59%, 22%)
HSV	hsv(204, 74%, 35%)
CMYK	cmyk(74.4%, 30%, 0%, 64.7%)
CIE-LAB	lab(25.18, -3.95, -20.20)
CIE-LCH	lch(25.18, 20.58, 258.93°)
OKLab	oklab(35.3% -0.0309 -0.057)
OKLCH	oklch(35.3% 0.065 241.6)
XYZ	xyz(3.9756, 4.4749, 10.3251)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F5A #5A3217

analogous

#175A54 #173F5A #171E5A

triadic

#173F5A #5A173F #3F5A17

tetradic

#173F5A #54175A #5A3217 #1E5A17

square

#173F5A #54175A #5A3217 #1E5A17

split-complementary

#173F5A #5A171E #5A5417

monochromatic

#061118 #0B1D29 #173F5A #23618B #3083BB

Accessibility & contrast

On white

11.08

#173F5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#173F5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F5A

11.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F5A	#FFFFFF	#000000	##FFFFFF
##173F5A	1.00	11.08	1.90	11.08
#FFFFFF	11.08	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333F5B

Deuteranopia (green-blind)

#29395A

Tritanopia (blue-blind)

#004648

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173f5a;
/* rgb */ color: rgb(23, 63, 90);
/* oklch */ color: oklch(35.3% 0.065 241.6);

Tailwind

colors: {
  custom: {
    50: '#5d7388',
    500: '#173f5a',
    950: '#000000',
  },
}

SCSS

$custom: #173f5a;
$custom-light: #5d7388;
$custom-dark: #000000;

JSON

{
  "hex": "#173f5a",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 90
  },
  "hsl": {
    "h": 204.179,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.35304,
    "c": 0.0648,
    "h": 241.6
  },
  "luminance": 0.04475
}

Semantic roles & 50–950 ramp

primary

#173F5A

secondary

#915E3C

accent

#8545E2

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #173F5A

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

Preview Lab → · Contrast checker → · Palette generator →