#173F5D#173F5D

#173F5D is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.5% C 0.069 H 244.3°. Best body text is #FFFFFF at 11.02:1 contrast (WCAG AA passes).

Color values

HEX	#173F5D
RGB	rgb(23, 63, 93)
HSL	hsl(206, 60%, 23%)
HSV	hsv(206, 75%, 36%)
CMYK	cmyk(75.3%, 32.3%, 0%, 63.5%)
CIE-LAB	lab(25.34, -2.76, -21.90)
CIE-LCH	lch(25.34, 22.07, 262.82°)
OKLab	oklab(35.48% -0.0298 -0.0619)
OKLCH	oklch(35.48% 0.069 244.3)
XYZ	xyz(4.1059, 4.5270, 11.0112)
Luminance	0.0453 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F5D #5D3517

analogous

#175D58 #173F5D #171C5D

triadic

#173F5D #5D173F #3F5D17

tetradic

#173F5D #58175D #5D3517 #1C5D17

square

#173F5D #58175D #5D3517 #1C5D17

split-complementary

#173F5D #5D171C #5D5817

monochromatic

#061119 #0B1E2C #173F5D #23608E #2F81BF

Accessibility & contrast

On white

11.02

#173F5D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#173F5D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F5D

11.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F5D	#FFFFFF	#000000	##FFFFFF
##173F5D	1.00	11.02	1.91	11.02
#FFFFFF	11.02	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#31405E

Deuteranopia (green-blind)

#28395C

Tritanopia (blue-blind)

#00464A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173f5d;
/* rgb */ color: rgb(23, 63, 93);
/* oklch */ color: oklch(35.5% 0.069 244.3);

Tailwind

colors: {
  custom: {
    50: '#5e738b',
    500: '#173f5d',
    950: '#000000',
  },
}

SCSS

$custom: #173f5d;
$custom-light: #5e738b;
$custom-dark: #000000;

JSON

{
  "hex": "#173f5d",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 93
  },
  "hsl": {
    "h": 205.714,
    "s": 60.345,
    "l": 22.745
  },
  "oklch": {
    "l": 0.35482,
    "c": 0.06871,
    "h": 244.3
  },
  "luminance": 0.04527
}

Semantic roles & 50–950 ramp

primary

#173F5D

secondary

#94623C

accent

#8944E3

background

#F5F7F8

surface

#EAEDF0

border

#C6C8CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #173F5D

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

Preview Lab → · Contrast checker → · Palette generator →