#173A57#173A57

#173A57 is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 33.8% C 0.065 H 246.4°. Best body text is #FFFFFF at 11.80:1 contrast (WCAG AA passes).

Color values

HEX	#173A57
RGB	rgb(23, 58, 87)
HSL	hsl(207, 58%, 22%)
HSV	hsv(207, 74%, 34%)
CMYK	cmyk(73.6%, 33.3%, 0%, 65.9%)
CIE-LAB	lab(23.32, -1.80, -21.15)
CIE-LCH	lch(23.32, 21.22, 265.13°)
OKLab	oklab(33.78% -0.0261 -0.0598)
OKLCH	oklch(33.78% 0.065 246.4)
XYZ	xyz(3.5861, 3.8960, 9.5780)
Luminance	0.0390 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A57 #573417

analogous

#175754 #173A57 #171A57

triadic

#173A57 #57173A #3A5717

tetradic

#173A57 #541757 #573417 #1A5717

square

#173A57 #541757 #573417 #1A5717

split-complementary

#173A57 #57171A #575417

monochromatic

#061018 #0A1A27 #173A57 #245A87 #317BB8

Accessibility & contrast

On white

11.80

#173A57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#173A57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A57

11.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A57	#FFFFFF	#000000	##FFFFFF
##173A57	1.00	11.80	1.78	11.80
#FFFFFF	11.80	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3B58

Deuteranopia (green-blind)

#243556

Tritanopia (blue-blind)

#004144

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #173a57;
/* rgb */ color: rgb(23, 58, 87);
/* oklch */ color: oklch(33.8% 0.065 246.4);

Tailwind

colors: {
  custom: {
    50: '#5d6f86',
    500: '#173a57',
    950: '#000000',
  },
}

SCSS

$custom: #173a57;
$custom-light: #5d6f86;
$custom-dark: #000000;

JSON

{
  "hex": "#173a57",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 87
  },
  "hsl": {
    "h": 207.188,
    "s": 58.182,
    "l": 21.569
  },
  "oklch": {
    "l": 0.33783,
    "c": 0.06526,
    "h": 246.4
  },
  "luminance": 0.03896
}

Semantic roles & 50–950 ramp

primary

#173A57

secondary

#8E613C

accent

#8D46E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #173A57

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

Preview Lab → · Contrast checker → · Palette generator →