#3166B4#3166B4

#3166B4 is a mid, vivid blue. Relative luminance 0.135; OKLCH L 51.5% C 0.136 H 258.2°. Best body text is #FFFFFF at 5.69:1 contrast (WCAG AA passes).

Color values

HEX	#3166B4
RGB	rgb(49, 102, 180)
HSL	hsl(216, 57%, 45%)
HSV	hsv(216, 73%, 71%)
CMYK	cmyk(72.8%, 43.3%, 0%, 29.4%)
CIE-LAB	lab(43.43, 9.47, -46.52)
CIE-LCH	lch(43.43, 47.48, 281.50°)
OKLab	oklab(51.51% -0.0278 -0.133)
OKLCH	oklch(51.51% 0.136 258.2)
XYZ	xyz(14.2532, 13.4494, 45.0160)
Luminance	0.1345 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3166B4 #B47F31

analogous

#31A8B4 #3166B4 #3D31B4

triadic

#3166B4 #B43166 #66B431

tetradic

#3166B4 #B431A8 #B47F31 #31B43D

square

#3166B4 #B431A8 #B47F31 #31B43D

split-complementary

#3166B4 #B43D31 #A8B431

monochromatic

#172F54 #244B84 #3166B4 #5285D0 #82A7DD

Accessibility & contrast

On white

5.69

#3166B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.69

#3166B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3166B4

5.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3166B4	#FFFFFF	#000000	##FFFFFF
##3166B4	1.00	5.69	3.69	5.69
#FFFFFF	5.69	1.00	21.00	1.00
#000000	3.69	21.00	1.00	21.00
##FFFFFF	5.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#406DB7

Deuteranopia (green-blind)

#2861B2

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3166b4;
/* rgb */ color: rgb(49, 102, 180);
/* oklch */ color: oklch(51.5% 0.136 258.2);

Tailwind

colors: {
  custom: {
    50: '#7a91cb',
    500: '#3166b4',
    950: '#000000',
  },
}

SCSS

$custom: #3166b4;
$custom-light: #7a91cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3166b4",
  "rgb": {
    "r": 49,
    "g": 102,
    "b": 180
  },
  "hsl": {
    "h": 215.725,
    "s": 57.205,
    "l": 44.902
  },
  "oklch": {
    "l": 0.51509,
    "c": 0.13593,
    "h": 258.2
  },
  "luminance": 0.13451
}

Semantic roles & 50–950 ramp

primary

#3166B4

secondary

#C6A87B

accent

#A347E0

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3166B4

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

Preview Lab → · Contrast checker → · Palette generator →