#3966BB#3966BB

#3966BB is a mid, vivid blue. Relative luminance 0.140; OKLCH L 52.3% C 0.143 H 261.8°. Best body text is #FFFFFF at 5.54:1 contrast (WCAG AA passes).

Color values

HEX	#3966BB
RGB	rgb(57, 102, 187)
HSL	hsl(219, 53%, 48%)
HSV	hsv(219, 70%, 73%)
CMYK	cmyk(69.5%, 45.5%, 0%, 26.7%)
CIE-LAB	lab(44.17, 13.24, -49.40)
CIE-LCH	lch(44.17, 51.14, 285.01°)
OKLab	oklab(52.31% -0.0204 -0.1414)
OKLCH	oklch(52.31% 0.143 261.8)
XYZ	xyz(15.4052, 13.9589, 48.8865)
Luminance	0.1396 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966BB #BB8E39

analogous

#39A7BB #3966BB #4D39BB

triadic

#3966BB #BB3966 #66BB39

tetradic

#3966BB #BB39A7 #BB8E39 #39BB4D

square

#3966BB #BB39A7 #BB8E39 #39BB4D

split-complementary

#3966BB #BB4D39 #A7BB39

monochromatic

#1C335D #2B4C8C #3966BB #6288CF #91ABDD

Accessibility & contrast

On white

5.54

#3966BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.79

#3966BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966BB

5.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966BB	#FFFFFF	#000000	##FFFFFF
##3966BB	1.00	5.54	3.79	5.54
#FFFFFF	5.54	1.00	21.00	1.00
#000000	3.79	21.00	1.00	21.00
##FFFFFF	5.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B6FBE

Deuteranopia (green-blind)

#2263B9

Tritanopia (blue-blind)

#007A87

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3966bb;
/* rgb */ color: rgb(57, 102, 187);
/* oklch */ color: oklch(52.3% 0.143 261.8);

Tailwind

colors: {
  custom: {
    50: '#7e91d0',
    500: '#3966bb',
    950: '#000000',
  },
}

SCSS

$custom: #3966bb;
$custom-light: #7e91d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3966bb",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 187
  },
  "hsl": {
    "h": 219.231,
    "s": 53.279,
    "l": 47.843
  },
  "oklch": {
    "l": 0.52306,
    "c": 0.14284,
    "h": 261.8
  },
  "luminance": 0.1396
}

Semantic roles & 50–950 ramp

primary

#3966BB

secondary

#C8B287

accent

#AA4BDD

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3966BB

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

Preview Lab → · Contrast checker → · Palette generator →