#173A5A#173A5A

#173A5A is a dark, moderate cyan. Relative luminance 0.039; OKLCH L 34.0% C 0.069 H 248.8°. Best body text is #FFFFFF at 11.74:1 contrast (WCAG AA passes).

Color values

HEX	#173A5A
RGB	rgb(23, 58, 90)
HSL	hsl(209, 59%, 22%)
HSV	hsv(209, 74%, 35%)
CMYK	cmyk(74.4%, 35.6%, 0%, 64.7%)
CIE-LAB	lab(23.49, -0.60, -22.85)
CIE-LCH	lch(23.49, 22.86, 268.50°)
OKLab	oklab(33.97% -0.0251 -0.0648)
OKLCH	oklch(33.97% 0.069 248.8)
XYZ	xyz(3.7112, 3.9461, 10.2370)
Luminance	0.0395 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A5A #5A3717

analogous

#175A59 #173A5A #17185A

triadic

#173A5A #5A173A #3A5A17

tetradic

#173A5A #59175A #5A3717 #185A17

square

#173A5A #59175A #5A3717 #185A17

split-complementary

#173A5A #5A1718 #5A5917

monochromatic

#061018 #0B1B29 #173A5A #23598B #3079BB

Accessibility & contrast

On white

11.74

#173A5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#173A5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A5A

11.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A5A	#FFFFFF	#000000	##FFFFFF
##173A5A	1.00	11.74	1.79	11.74
#FFFFFF	11.74	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3B5B

Deuteranopia (green-blind)

#223559

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #173a5a;
/* rgb */ color: rgb(23, 58, 90);
/* oklch */ color: oklch(34.0% 0.069 248.8);

Tailwind

colors: {
  custom: {
    50: '#5d6f89',
    500: '#173a5a',
    950: '#000000',
  },
}

SCSS

$custom: #173a5a;
$custom-light: #5d6f89;
$custom-dark: #000000;

JSON

{
  "hex": "#173a5a",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 90
  },
  "hsl": {
    "h": 208.657,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.3397,
    "c": 0.06946,
    "h": 248.8
  },
  "luminance": 0.03946
}

Semantic roles & 50–950 ramp

primary

#173A5A

secondary

#91643C

accent

#9045E2

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173A5A

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

Preview Lab → · Contrast checker → · Palette generator →