#3966B2#3966B2

#3966B2 is a mid, vivid blue. Relative luminance 0.136; OKLCH L 51.7% C 0.130 H 260.2°. Best body text is #FFFFFF at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#3966B2
RGB	rgb(57, 102, 178)
HSL	hsl(218, 51%, 46%)
HSV	hsv(218, 68%, 70%)
CMYK	cmyk(68%, 42.7%, 0%, 30.2%)
CIE-LAB	lab(43.63, 9.95, -45.02)
CIE-LCH	lch(43.63, 46.10, 282.47°)
OKLab	oklab(51.71% -0.0221 -0.1285)
OKLCH	oklch(51.71% 0.13 260.2)
XYZ	xyz(14.4717, 13.5855, 43.9704)
Luminance	0.1359 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966B2 #B28539

analogous

#39A2B2 #3966B2 #4839B2

triadic

#3966B2 #B23966 #66B239

tetradic

#3966B2 #B239A2 #B28539 #39B248

square

#3966B2 #B239A2 #B28539 #39B248

split-complementary

#3966B2 #B24839 #A2B239

monochromatic

#1B3155 #2A4B84 #3966B2 #5D86CB #8BA9DA

Accessibility & contrast

On white

5.65

#3966B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.72

#3966B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966B2

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966B2	#FFFFFF	#000000	##FFFFFF
##3966B2	1.00	5.65	3.72	5.65
#FFFFFF	5.65	1.00	21.00	1.00
#000000	3.72	21.00	1.00	21.00
##FFFFFF	5.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#426DB5

Deuteranopia (green-blind)

#2F62B0

Tritanopia (blue-blind)

#007883

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3966b2;
/* rgb */ color: rgb(57, 102, 178);
/* oklch */ color: oklch(51.7% 0.130 260.2);

Tailwind

colors: {
  custom: {
    50: '#7d91c9',
    500: '#3966b2',
    950: '#000000',
  },
}

SCSS

$custom: #3966b2;
$custom-light: #7d91c9;
$custom-dark: #000000;

JSON

{
  "hex": "#3966b2",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 178
  },
  "hsl": {
    "h": 217.686,
    "s": 51.489,
    "l": 46.078
  },
  "oklch": {
    "l": 0.51713,
    "c": 0.13039,
    "h": 260.2
  },
  "luminance": 0.13587
}

Semantic roles & 50–950 ramp

primary

#3966B2

secondary

#C4AC82

accent

#A64DDB

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3966B2

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

Preview Lab → · Contrast checker → · Palette generator →