#173A5E#173A5E

#173A5E is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.075 H 251.5°. Best body text is #FFFFFF at 11.65:1 contrast (WCAG AA passes).

Color values

HEX	#173A5E
RGB	rgb(23, 58, 94)
HSL	hsl(210, 61%, 23%)
HSV	hsv(210, 76%, 37%)
CMYK	cmyk(75.5%, 38.3%, 0%, 63.1%)
CIE-LAB	lab(23.72, 1.02, -25.10)
CIE-LCH	lch(23.72, 25.12, 272.34°)
OKLab	oklab(34.23% -0.0239 -0.0713)
OKLCH	oklch(34.23% 0.075 251.5)
XYZ	xyz(3.8860, 4.0160, 11.1579)
Luminance	0.0402 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A5E #5E3B17

analogous

#175D5E #173A5E #18175E

triadic

#173A5E #5E173A #3A5E17

tetradic

#173A5E #5E175D #5E3B17 #175E18

square

#173A5E #5E175D #5E3B17 #175E18

split-complementary

#173A5E #5E1817 #5D5E17

monochromatic

#060F19 #0B1C2D #173A5E #23588F #2F77C0

Accessibility & contrast

On white

11.65

#173A5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#173A5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A5E

11.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A5E	#FFFFFF	#000000	##FFFFFF
##173A5E	1.00	11.65	1.80	11.65
#FFFFFF	11.65	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A3C5F

Deuteranopia (green-blind)

#1F355D

Tritanopia (blue-blind)

#004247

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #173a5e;
/* rgb */ color: rgb(23, 58, 94);
/* oklch */ color: oklch(34.2% 0.075 251.5);

Tailwind

colors: {
  custom: {
    50: '#5e6f8c',
    500: '#173a5e',
    950: '#000000',
  },
}

SCSS

$custom: #173a5e;
$custom-light: #5e6f8c;
$custom-dark: #000000;

JSON

{
  "hex": "#173a5e",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 94
  },
  "hsl": {
    "h": 210.423,
    "s": 60.684,
    "l": 22.941
  },
  "oklch": {
    "l": 0.34228,
    "c": 0.07522,
    "h": 251.5
  },
  "luminance": 0.04016
}

Semantic roles & 50–950 ramp

primary

#173A5E

secondary

#95693C

accent

#9544E4

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #173A5E

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

Preview Lab → · Contrast checker → · Palette generator →