#173F5C#173F5C

#173F5C is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.4% C 0.067 H 243.4°. Best body text is #FFFFFF at 11.04:1 contrast (WCAG AA passes).

Color values

HEX	#173F5C
RGB	rgb(23, 63, 92)
HSL	hsl(205, 60%, 23%)
HSV	hsv(205, 75%, 36%)
CMYK	cmyk(75%, 31.5%, 0%, 63.9%)
CIE-LAB	lab(25.29, -3.16, -21.33)
CIE-LCH	lch(25.29, 21.57, 261.58°)
OKLab	oklab(35.42% -0.0301 -0.0603)
OKLCH	oklch(35.42% 0.067 243.4)
XYZ	xyz(4.0619, 4.5094, 10.7795)
Luminance	0.0451 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F5C #5C3417

analogous

#175C56 #173F5C #171D5C

triadic

#173F5C #5C173F #3F5C17

tetradic

#173F5C #56175C #5C3417 #1D5C17

square

#173F5C #56175C #5C3417 #1D5C17

split-complementary

#173F5C #5C171D #5C5617

monochromatic

#061118 #0B1D2B #173F5C #23618D #2F82BE

Accessibility & contrast

On white

11.04

#173F5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#173F5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F5C

11.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F5C	#FFFFFF	#000000	##FFFFFF
##173F5C	1.00	11.04	1.90	11.04
#FFFFFF	11.04	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#32405D

Deuteranopia (green-blind)

#28395B

Tritanopia (blue-blind)

#004649

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173f5c;
/* rgb */ color: rgb(23, 63, 92);
/* oklch */ color: oklch(35.4% 0.067 243.4);

Tailwind

colors: {
  custom: {
    50: '#5e738a',
    500: '#173f5c',
    950: '#000000',
  },
}

SCSS

$custom: #173f5c;
$custom-light: #5e738a;
$custom-dark: #000000;

JSON

{
  "hex": "#173f5c",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 92
  },
  "hsl": {
    "h": 205.217,
    "s": 60,
    "l": 22.549
  },
  "oklch": {
    "l": 0.35422,
    "c": 0.0674,
    "h": 243.4
  },
  "luminance": 0.0451
}

Semantic roles & 50–950 ramp

primary

#173F5C

secondary

#93603C

accent

#8745E3

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #173F5C

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

Preview Lab → · Contrast checker → · Palette generator →