#3166B3#3166B3

#3166B3 is a mid, vivid blue. Relative luminance 0.134; OKLCH L 51.4% C 0.135 H 258.0°. Best body text is #FFFFFF at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#3166B3
RGB	rgb(49, 102, 179)
HSL	hsl(216, 57%, 45%)
HSV	hsv(216, 73%, 70%)
CMYK	cmyk(72.6%, 43%, 0%, 29.8%)
CIE-LAB	lab(43.37, 9.09, -46.03)
CIE-LCH	lch(43.37, 46.92, 281.17°)
OKLab	oklab(51.44% -0.028 -0.1316)
OKLCH	oklch(51.44% 0.135 258)
XYZ	xyz(14.1517, 13.4088, 44.4814)
Luminance	0.1341 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3166B3 #B37E31

analogous

#31A7B3 #3166B3 #3D31B3

triadic

#3166B3 #B33166 #66B331

tetradic

#3166B3 #B331A7 #B37E31 #31B33D

square

#3166B3 #B331A7 #B37E31 #31B33D

split-complementary

#3166B3 #B33D31 #A7B331

monochromatic

#172F53 #244B83 #3166B3 #5285D0 #82A7DD

Accessibility & contrast

On white

5.70

#3166B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.68

#3166B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3166B3

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3166B3	#FFFFFF	#000000	##FFFFFF
##3166B3	1.00	5.70	3.68	5.70
#FFFFFF	5.70	1.00	21.00	1.00
#000000	3.68	21.00	1.00	21.00
##FFFFFF	5.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#416DB6

Deuteranopia (green-blind)

#2A61B1

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3166b3;
/* rgb */ color: rgb(49, 102, 179);
/* oklch */ color: oklch(51.4% 0.135 258.0);

Tailwind

colors: {
  custom: {
    50: '#7a91ca',
    500: '#3166b3',
    950: '#000000',
  },
}

SCSS

$custom: #3166b3;
$custom-light: #7a91ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3166b3",
  "rgb": {
    "r": 49,
    "g": 102,
    "b": 179
  },
  "hsl": {
    "h": 215.538,
    "s": 57.018,
    "l": 44.706
  },
  "oklch": {
    "l": 0.51443,
    "c": 0.13457,
    "h": 258
  },
  "luminance": 0.1341
}

Semantic roles & 50–950 ramp

primary

#3166B3

secondary

#C6A77A

accent

#A248E0

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3166B3

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

Preview Lab → · Contrast checker → · Palette generator →