#173F5B#173F5B

#173F5B is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.4% C 0.066 H 242.5°. Best body text is #FFFFFF at 11.06:1 contrast (WCAG AA passes).

Color values

HEX	#173F5B
RGB	rgb(23, 63, 91)
HSL	hsl(205, 60%, 22%)
HSV	hsv(205, 75%, 36%)
CMYK	cmyk(74.7%, 30.8%, 0%, 64.3%)
CIE-LAB	lab(25.24, -3.56, -20.77)
CIE-LCH	lch(25.24, 21.07, 260.29°)
OKLab	oklab(35.36% -0.0305 -0.0586)
OKLCH	oklch(35.36% 0.066 242.5)
XYZ	xyz(4.0185, 4.4921, 10.5508)
Luminance	0.0449 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F5B #5B3317

analogous

#175B55 #173F5B #171D5B

triadic

#173F5B #5B173F #3F5B17

tetradic

#173F5B #55175B #5B3317 #1D5B17

square

#173F5B #55175B #5B3317 #1D5B17

split-complementary

#173F5B #5B171D #5B5517

monochromatic

#061118 #0B1D2A #173F5B #23618C #3083BD

Accessibility & contrast

On white

11.06

#173F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#173F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F5B

11.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F5B	#FFFFFF	#000000	##FFFFFF
##173F5B	1.00	11.06	1.90	11.06
#FFFFFF	11.06	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323F5C

Deuteranopia (green-blind)

#29395A

Tritanopia (blue-blind)

#004649

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173f5b;
/* rgb */ color: rgb(23, 63, 91);
/* oklch */ color: oklch(35.4% 0.066 242.5);

Tailwind

colors: {
  custom: {
    50: '#5e7389',
    500: '#173f5b',
    950: '#000000',
  },
}

SCSS

$custom: #173f5b;
$custom-light: #5e7389;
$custom-dark: #000000;

JSON

{
  "hex": "#173f5b",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 91
  },
  "hsl": {
    "h": 204.706,
    "s": 59.649,
    "l": 22.353
  },
  "oklch": {
    "l": 0.35363,
    "c": 0.06609,
    "h": 242.5
  },
  "luminance": 0.04493
}

Semantic roles & 50–950 ramp

primary

#173F5B

secondary

#925F3C

accent

#8645E3

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #173F5B

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

Preview Lab → · Contrast checker → · Palette generator →