#173A55#173A55

#173A55 is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 33.7% C 0.063 H 244.6°. Best body text is #FFFFFF at 11.85:1 contrast (WCAG AA passes).

Color values

HEX	#173A55
RGB	rgb(23, 58, 85)
HSL	hsl(206, 57%, 21%)
HSV	hsv(206, 73%, 33%)
CMYK	cmyk(72.9%, 31.8%, 0%, 66.7%)
CIE-LAB	lab(23.22, -2.60, -20.00)
CIE-LCH	lch(23.22, 20.17, 262.59°)
OKLab	oklab(33.66% -0.0268 -0.0565)
OKLCH	oklch(33.66% 0.063 244.6)
XYZ	xyz(3.5055, 3.8638, 9.1536)
Luminance	0.0386 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A55 #553217

analogous

#175551 #173A55 #171B55

triadic

#173A55 #55173A #3A5517

tetradic

#173A55 #511755 #553217 #1B5517

square

#173A55 #511755 #553217 #1B5517

split-complementary

#173A55 #55171B #555117

monochromatic

#071018 #0A1925 #173A55 #245B85 #317CB5

Accessibility & contrast

On white

11.85

#173A55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#173A55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A55

11.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A55	#FFFFFF	#000000	##FFFFFF
##173A55	1.00	11.85	1.77	11.85
#FFFFFF	11.85	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3B56

Deuteranopia (green-blind)

#253554

Tritanopia (blue-blind)

#004143

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #173a55;
/* rgb */ color: rgb(23, 58, 85);
/* oklch */ color: oklch(33.7% 0.063 244.6);

Tailwind

colors: {
  custom: {
    50: '#5c7085',
    500: '#173a55',
    950: '#000000',
  },
}

SCSS

$custom: #173a55;
$custom-light: #5c7085;
$custom-dark: #000000;

JSON

{
  "hex": "#173a55",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 85
  },
  "hsl": {
    "h": 206.129,
    "s": 57.407,
    "l": 21.176
  },
  "oklch": {
    "l": 0.33662,
    "c": 0.06251,
    "h": 244.6
  },
  "luminance": 0.03864
}

Semantic roles & 50–950 ramp

primary

#173A55

secondary

#8C5F3C

accent

#8A47E1

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#04070B

muted

#797A7C

Preview Lab

Preview with #173A55

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

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