#3966B5#3966B5

#3966B5 is a mid, vivid blue. Relative luminance 0.137; OKLCH L 51.9% C 0.135 H 260.8°. Best body text is #FFFFFF at 5.61:1 contrast (WCAG AA passes).

Color values

HEX	#3966B5
RGB	rgb(57, 102, 181)
HSL	hsl(218, 52%, 47%)
HSV	hsv(218, 69%, 71%)
CMYK	cmyk(68.5%, 43.6%, 0%, 29%)
CIE-LAB	lab(43.81, 11.05, -46.49)
CIE-LCH	lch(43.81, 47.78, 283.37°)
OKLab	oklab(51.91% -0.0215 -0.1328)
OKLCH	oklch(51.91% 0.135 260.8)
XYZ	xyz(14.7762, 13.7073, 45.5742)
Luminance	0.1371 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966B5 #B58839

analogous

#39A4B5 #3966B5 #4A39B5

triadic

#3966B5 #B53966 #66B539

tetradic

#3966B5 #B539A4 #B58839 #39B54A

square

#3966B5 #B539A4 #B58839 #39B54A

split-complementary

#3966B5 #B54A39 #A4B539

monochromatic

#1C3258 #2A4C86 #3966B5 #5F87CD #8DAADB

Accessibility & contrast

On white

5.61

#3966B5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.74

#3966B5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966B5

5.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966B5	#FFFFFF	#000000	##FFFFFF
##3966B5	1.00	5.61	3.74	5.61
#FFFFFF	5.61	1.00	21.00	1.00
#000000	3.74	21.00	1.00	21.00
##FFFFFF	5.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#406EB8

Deuteranopia (green-blind)

#2B62B3

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3966b5;
/* rgb */ color: rgb(57, 102, 181);
/* oklch */ color: oklch(51.9% 0.135 260.8);

Tailwind

colors: {
  custom: {
    50: '#7d91cc',
    500: '#3966b5',
    950: '#000000',
  },
}

SCSS

$custom: #3966b5;
$custom-light: #7d91cc;
$custom-dark: #000000;

JSON

{
  "hex": "#3966b5",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 181
  },
  "hsl": {
    "h": 218.226,
    "s": 52.101,
    "l": 46.667
  },
  "oklch": {
    "l": 0.51908,
    "c": 0.13455,
    "h": 260.8
  },
  "luminance": 0.13709
}

Semantic roles & 50–950 ramp

primary

#3966B5

secondary

#C6AE84

accent

#A84CDC

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3966B5

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

Preview Lab → · Contrast checker → · Palette generator →