#3966B3#3966B3

#3966B3 is a mid, vivid blue. Relative luminance 0.136; OKLCH L 51.8% C 0.132 H 260.4°. Best body text is #FFFFFF at 5.64:1 contrast (WCAG AA passes).

Color values

HEX	#3966B3
RGB	rgb(57, 102, 179)
HSL	hsl(218, 52%, 46%)
HSV	hsv(218, 68%, 70%)
CMYK	cmyk(68.2%, 43%, 0%, 29.8%)
CIE-LAB	lab(43.69, 10.32, -45.51)
CIE-LCH	lch(43.69, 46.66, 282.78°)
OKLab	oklab(51.78% -0.0219 -0.1299)
OKLCH	oklch(51.78% 0.132 260.4)
XYZ	xyz(14.5725, 13.6258, 44.5011)
Luminance	0.1363 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966B3 #B38639

analogous

#39A3B3 #3966B3 #4939B3

triadic

#3966B3 #B33966 #66B339

tetradic

#3966B3 #B339A3 #B38639 #39B349

square

#3966B3 #B339A3 #B38639 #39B349

split-complementary

#3966B3 #B34939 #A3B339

monochromatic

#1B3156 #2A4C85 #3966B3 #5E86CC #8CA9DA

Accessibility & contrast

On white

5.64

#3966B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.73

#3966B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966B3

5.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966B3	#FFFFFF	#000000	##FFFFFF
##3966B3	1.00	5.64	3.73	5.64
#FFFFFF	5.64	1.00	21.00	1.00
#000000	3.73	21.00	1.00	21.00
##FFFFFF	5.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#426DB6

Deuteranopia (green-blind)

#2D62B1

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3966b3;
/* rgb */ color: rgb(57, 102, 179);
/* oklch */ color: oklch(51.8% 0.132 260.4);

Tailwind

colors: {
  custom: {
    50: '#7d91ca',
    500: '#3966b3',
    950: '#000000',
  },
}

SCSS

$custom: #3966b3;
$custom-light: #7d91ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3966b3",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 179
  },
  "hsl": {
    "h": 217.869,
    "s": 51.695,
    "l": 46.275
  },
  "oklch": {
    "l": 0.51778,
    "c": 0.13178,
    "h": 260.4
  },
  "luminance": 0.13627
}

Semantic roles & 50–950 ramp

primary

#3966B3

secondary

#C5AD83

accent

#A74DDB

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3966B3

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

Preview Lab → · Contrast checker → · Palette generator →