#173F6B#173F6B

#173F6B is a dark, moderate cyan. Relative luminance 0.048; OKLCH L 36.4% C 0.088 H 253.2°. Best body text is #FFFFFF at 10.72:1 contrast (WCAG AA passes).

Color values

HEX	#173F6B
RGB	rgb(23, 63, 107)
HSL	hsl(211, 65%, 25%)
HSV	hsv(211, 79%, 42%)
CMYK	cmyk(78.5%, 41.1%, 0%, 58%)
CIE-LAB	lab(26.15, 2.92, -29.65)
CIE-LCH	lch(26.15, 29.79, 275.62°)
OKLab	oklab(36.38% -0.0255 -0.0846)
OKLCH	oklch(36.38% 0.088 253.2)
XYZ	xyz(4.7837, 4.7982, 14.5811)
Luminance	0.0480 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F6B #6B4317

analogous

#17696B #173F6B #19176B

triadic

#173F6B #6B173F #3F6B17

tetradic

#173F6B #6B1769 #6B4317 #176B19

square

#173F6B #6B1769 #6B4317 #176B19

split-complementary

#173F6B #6B1917 #696B17

monochromatic

#050F19 #0C2139 #173F6B #225D9D #2D7AD0

Accessibility & contrast

On white

10.72

#173F6B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#173F6B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F6B

10.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F6B	#FFFFFF	#000000	##FFFFFF
##173F6B	1.00	10.72	1.96	10.72
#FFFFFF	10.72	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A426D

Deuteranopia (green-blind)

#1D3A6A

Tritanopia (blue-blind)

#00494F

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173f6b;
/* rgb */ color: rgb(23, 63, 107);
/* oklch */ color: oklch(36.4% 0.088 253.2);

Tailwind

colors: {
  custom: {
    50: '#617395',
    500: '#173f6b',
    950: '#000000',
  },
}

SCSS

$custom: #173f6b;
$custom-light: #617395;
$custom-dark: #000000;

JSON

{
  "hex": "#173f6b",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 107
  },
  "hsl": {
    "h": 211.429,
    "s": 64.615,
    "l": 25.49
  },
  "oklch": {
    "l": 0.36382,
    "c": 0.08832,
    "h": 253.2
  },
  "luminance": 0.04799
}

Semantic roles & 50–950 ramp

primary

#173F6B

secondary

#A1713D

accent

#9840E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080D

muted

#7A7B7E

Preview Lab

Preview with #173F6B

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

Preview Lab → · Contrast checker → · Palette generator →