#3173B4#3173B4

#3173B4 is a mid, vivid cyan. Relative luminance 0.162; OKLCH L 54.5% C 0.122 H 250.8°. Best body text is #FFFFFF at 4.95:1 contrast (WCAG AA passes).

Color values

HEX	#3173B4
RGB	rgb(49, 115, 180)
HSL	hsl(210, 57%, 45%)
HSV	hsv(210, 73%, 71%)
CMYK	cmyk(72.8%, 36.1%, 0%, 29.4%)
CIE-LAB	lab(47.25, 1.33, -40.45)
CIE-LCH	lch(47.25, 40.48, 271.89°)
OKLab	oklab(54.48% -0.0401 -0.115)
OKLCH	oklch(54.48% 0.122 250.8)
XYZ	xyz(15.6325, 16.2080, 45.4757)
Luminance	0.1621 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3173B4 #B47231

analogous

#31B4B3 #3173B4 #3132B4

triadic

#3173B4 #B43173 #73B431

tetradic

#3173B4 #B331B4 #B47231 #32B431

square

#3173B4 #B331B4 #B47231 #32B431

split-complementary

#3173B4 #B43132 #B4B331

monochromatic

#173654 #245484 #3173B4 #5292D0 #82B0DD

Accessibility & contrast

On white

4.95

#3173B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.24

#3173B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3173B4

4.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3173B4	#FFFFFF	#000000	##FFFFFF
##3173B4	1.00	4.95	4.24	4.95
#FFFFFF	4.95	1.00	21.00	1.00
#000000	4.24	21.00	1.00	21.00
##FFFFFF	4.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5577B7

Deuteranopia (green-blind)

#426AB3

Tritanopia (blue-blind)

#00828B

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3173b4;
/* rgb */ color: rgb(49, 115, 180);
/* oklch */ color: oklch(54.5% 0.122 250.8);

Tailwind

colors: {
  custom: {
    50: '#7a9acb',
    500: '#3173b4',
    950: '#000000',
  },
}

SCSS

$custom: #3173b4;
$custom-light: #7a9acb;
$custom-dark: #000000;

JSON

{
  "hex": "#3173b4",
  "rgb": {
    "r": 49,
    "g": 115,
    "b": 180
  },
  "hsl": {
    "h": 209.771,
    "s": 57.205,
    "l": 44.902
  },
  "oklch": {
    "l": 0.5448,
    "c": 0.12182,
    "h": 250.8
  },
  "luminance": 0.1621
}

Semantic roles & 50–950 ramp

primary

#3173B4

secondary

#C6A07B

accent

#9347E0

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #3173B4

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

Preview Lab → · Contrast checker → · Palette generator →