#173E5A#173E5A

#173E5A is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.0% C 0.066 H 243.1°. Best body text is #FFFFFF at 11.21:1 contrast (WCAG AA passes).

Color values

HEX	#173E5A
RGB	rgb(23, 62, 90)
HSL	hsl(205, 59%, 22%)
HSV	hsv(205, 74%, 35%)
CMYK	cmyk(74.4%, 31.1%, 0%, 64.7%)
CIE-LAB	lab(24.84, -3.29, -20.73)
CIE-LCH	lch(24.84, 20.99, 260.98°)
OKLab	oklab(35.03% -0.0297 -0.0585)
OKLCH	oklch(35.03% 0.066 243.1)
XYZ	xyz(3.9207, 4.3652, 10.3068)
Luminance	0.0437 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173E5A #5A3317

analogous

#175A55 #173E5A #171C5A

triadic

#173E5A #5A173E #3E5A17

tetradic

#173E5A #55175A #5A3317 #1C5A17

square

#173E5A #55175A #5A3317 #1C5A17

split-complementary

#173E5A #5A171C #5A5517

monochromatic

#061118 #0B1C29 #173E5A #23608B #3081BB

Accessibility & contrast

On white

11.21

#173E5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#173E5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173E5A

11.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173E5A	#FFFFFF	#000000	##FFFFFF
##173E5A	1.00	11.21	1.87	11.21
#FFFFFF	11.21	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313F5B

Deuteranopia (green-blind)

#283859

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #173e5a;
/* rgb */ color: rgb(23, 62, 90);
/* oklch */ color: oklch(35.0% 0.066 243.1);

Tailwind

colors: {
  custom: {
    50: '#5d7388',
    500: '#173e5a',
    950: '#000000',
  },
}

SCSS

$custom: #173e5a;
$custom-light: #5d7388;
$custom-dark: #000000;

JSON

{
  "hex": "#173e5a",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 90
  },
  "hsl": {
    "h": 205.075,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.35035,
    "c": 0.06564,
    "h": 243.1
  },
  "luminance": 0.04366
}

Semantic roles & 50–950 ramp

primary

#173E5A

secondary

#915F3C

accent

#8745E2

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #173E5A

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

Preview Lab → · Contrast checker → · Palette generator →