#3966B7#3966B7

#3966B7 is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.0% C 0.137 H 261.1°. Best body text is #FFFFFF at 5.59:1 contrast (WCAG AA passes).

Color values

HEX	#3966B7
RGB	rgb(57, 102, 183)
HSL	hsl(219, 53%, 47%)
HSV	hsv(219, 69%, 72%)
CMYK	cmyk(68.9%, 44.3%, 0%, 28.2%)
CIE-LAB	lab(43.93, 11.78, -47.46)
CIE-LCH	lch(43.93, 48.90, 283.94°)
OKLab	oklab(52.04% -0.0212 -0.1357)
OKLCH	oklch(52.04% 0.137 261.1)
XYZ	xyz(14.9829, 13.7900, 46.6627)
Luminance	0.1379 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966B7 #B78A39

analogous

#39A5B7 #3966B7 #4B39B7

triadic

#3966B7 #B73966 #66B739

tetradic

#3966B7 #B739A5 #B78A39 #39B74B

square

#3966B7 #B739A5 #B78A39 #39B74B

split-complementary

#3966B7 #B74B39 #A5B739

monochromatic

#1C325A #2A4C88 #3966B7 #6087CD #8EAADC

Accessibility & contrast

On white

5.59

#3966B7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.76

#3966B7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966B7

5.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966B7	#FFFFFF	#000000	##FFFFFF
##3966B7	1.00	5.59	3.76	5.59
#FFFFFF	5.59	1.00	21.00	1.00
#000000	3.76	21.00	1.00	21.00
##FFFFFF	5.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F6EBA

Deuteranopia (green-blind)

#2862B5

Tritanopia (blue-blind)

#007985

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3966b7;
/* rgb */ color: rgb(57, 102, 183);
/* oklch */ color: oklch(52.0% 0.137 261.1);

Tailwind

colors: {
  custom: {
    50: '#7e91cd',
    500: '#3966b7',
    950: '#000000',
  },
}

SCSS

$custom: #3966b7;
$custom-light: #7e91cd;
$custom-dark: #000000;

JSON

{
  "hex": "#3966b7",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 183
  },
  "hsl": {
    "h": 218.571,
    "s": 52.5,
    "l": 47.059
  },
  "oklch": {
    "l": 0.5204,
    "c": 0.13732,
    "h": 261.1
  },
  "luminance": 0.13791
}

Semantic roles & 50–950 ramp

primary

#3966B7

secondary

#C7AF85

accent

#A84CDC

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3966B7

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

Preview Lab → · Contrast checker → · Palette generator →