#3173B5#3173B5

#3173B5 is a mid, vivid cyan. Relative luminance 0.163; OKLCH L 54.5% C 0.123 H 251.1°. Best body text is #FFFFFF at 4.94:1 contrast (WCAG AA passes).

Color values

HEX	#3173B5
RGB	rgb(49, 115, 181)
HSL	hsl(210, 57%, 45%)
HSV	hsv(210, 73%, 71%)
CMYK	cmyk(72.9%, 36.5%, 0%, 29%)
CIE-LAB	lab(47.30, 1.70, -40.95)
CIE-LCH	lch(47.30, 40.98, 272.38°)
OKLab	oklab(54.54% -0.0398 -0.1165)
OKLCH	oklch(54.54% 0.123 251.1)
XYZ	xyz(15.7347, 16.2489, 46.0142)
Luminance	0.1625 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3173B5 #B57331

analogous

#31B5B5 #3173B5 #3131B5

triadic

#3173B5 #B53173 #73B531

tetradic

#3173B5 #B531B5 #B57331 #31B531

square

#3173B5 #B531B5 #B57331 #31B531

split-complementary

#3173B5 #B53131 #B5B531

monochromatic

#173655 #245485 #3173B5 #5392D0 #83B0DD

Accessibility & contrast

On white

4.94

#3173B5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.25

#3173B5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3173B5

4.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3173B5	#FFFFFF	#000000	##FFFFFF
##3173B5	1.00	4.94	4.25	4.94
#FFFFFF	4.94	1.00	21.00	1.00
#000000	4.25	21.00	1.00	21.00
##FFFFFF	4.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5577B8

Deuteranopia (green-blind)

#416BB4

Tritanopia (blue-blind)

#00838B

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3173b5;
/* rgb */ color: rgb(49, 115, 181);
/* oklch */ color: oklch(54.5% 0.123 251.1);

Tailwind

colors: {
  custom: {
    50: '#7a9acb',
    500: '#3173b5',
    950: '#000000',
  },
}

SCSS

$custom: #3173b5;
$custom-light: #7a9acb;
$custom-dark: #000000;

JSON

{
  "hex": "#3173b5",
  "rgb": {
    "r": 49,
    "g": 115,
    "b": 181
  },
  "hsl": {
    "h": 210,
    "s": 57.391,
    "l": 45.098
  },
  "oklch": {
    "l": 0.54539,
    "c": 0.1231,
    "h": 251.1
  },
  "luminance": 0.16251
}

Semantic roles & 50–950 ramp

primary

#3173B5

secondary

#C7A17B

accent

#9447E1

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #3173B5

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

Preview Lab → · Contrast checker → · Palette generator →