#173C8F#173C8F

#173C8F is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.144 H 263.2°. Best body text is #FFFFFF at 10.10:1 contrast (WCAG AA passes).

Color values

HEX	#173C8F
RGB	rgb(23, 60, 143)
HSL	hsl(222, 72%, 33%)
HSV	hsv(222, 84%, 56%)
CMYK	cmyk(83.9%, 58%, 0%, 43.9%)
CIE-LAB	lab(27.84, 19.89, -49.54)
CIE-LCH	lch(27.84, 53.38, 291.88°)
OKLab	oklab(38.5% -0.0171 -0.1431)
OKLCH	oklch(38.5% 0.144 263.2)
XYZ	xyz(6.9254, 5.3962, 26.6578)
Luminance	0.0540 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C8F #8F6A17

analogous

#17788F #173C8F #2E178F

triadic

#173C8F #8F173C #3C8F17

tetradic

#173C8F #8F1778 #8F6A17 #178F2E

square

#173C8F #8F1778 #8F6A17 #178F2E

split-complementary

#173C8F #8F2E17 #788F17

monochromatic

#061026 #0F265A #173C8F #1F52C4 #4071E0

Accessibility & contrast

On white

10.10

#173C8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#173C8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C8F

10.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C8F	#FFFFFF	#000000	##FFFFFF
##173C8F	1.00	10.10	2.08	10.10
#FFFFFF	10.10	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#003C8D

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173c8f;
/* rgb */ color: rgb(23, 60, 143);
/* oklch */ color: oklch(38.5% 0.144 263.2);

Tailwind

colors: {
  custom: {
    50: '#6a71b0',
    500: '#173c8f',
    950: '#000000',
  },
}

SCSS

$custom: #173c8f;
$custom-light: #6a71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173c8f",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 143
  },
  "hsl": {
    "h": 221.5,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.385,
    "c": 0.14414,
    "h": 263.2
  },
  "luminance": 0.05397
}

Semantic roles & 50–950 ramp

primary

#173C8F

secondary

#C19941

accent

#B739EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080711

muted

#7A7A80

Preview Lab

Preview with #173C8F

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

Preview Lab → · Contrast checker → · Palette generator →