#173B5C#173B5C

#173B5C is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.4% C 0.071 H 248.9°. Best body text is #FFFFFF at 11.56:1 contrast (WCAG AA passes).

Color values

HEX	#173B5C
RGB	rgb(23, 59, 92)
HSL	hsl(209, 60%, 23%)
HSV	hsv(209, 75%, 36%)
CMYK	cmyk(75%, 35.9%, 0%, 63.9%)
CIE-LAB	lab(23.94, -0.47, -23.45)
CIE-LCH	lch(23.94, 23.46, 268.85°)
OKLab	oklab(34.36% -0.0256 -0.0665)
OKLCH	oklch(34.36% 0.071 248.9)
XYZ	xyz(3.8484, 4.0824, 10.7083)
Luminance	0.0408 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B5C #5C3817

analogous

#175C5B #173B5C #17185C

triadic

#173B5C #5C173B #3B5C17

tetradic

#173B5C #5B175C #5C3817 #185C17

square

#173B5C #5B175C #5C3817 #185C17

split-complementary

#173B5C #5C1718 #5C5B17

monochromatic

#061018 #0B1C2B #173B5C #235A8D #2F7ABE

Accessibility & contrast

On white

11.56

#173B5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#173B5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B5C

11.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B5C	#FFFFFF	#000000	##FFFFFF
##173B5C	1.00	11.56	1.82	11.56
#FFFFFF	11.56	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3D5D

Deuteranopia (green-blind)

#22365B

Tritanopia (blue-blind)

#004347

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173b5c;
/* rgb */ color: rgb(23, 59, 92);
/* oklch */ color: oklch(34.4% 0.071 248.9);

Tailwind

colors: {
  custom: {
    50: '#5e708a',
    500: '#173b5c',
    950: '#000000',
  },
}

SCSS

$custom: #173b5c;
$custom-light: #5e708a;
$custom-dark: #000000;

JSON

{
  "hex": "#173b5c",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 92
  },
  "hsl": {
    "h": 208.696,
    "s": 60,
    "l": 22.549
  },
  "oklch": {
    "l": 0.34361,
    "c": 0.07126,
    "h": 248.9
  },
  "luminance": 0.04083
}

Semantic roles & 50–950 ramp

primary

#173B5C

secondary

#93663C

accent

#9045E3

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173B5C

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

Preview Lab → · Contrast checker → · Palette generator →