#3966B8#3966B8

#3966B8 is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.1% C 0.139 H 261.3°. Best body text is #FFFFFF at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#3966B8
RGB	rgb(57, 102, 184)
HSL	hsl(219, 53%, 47%)
HSV	hsv(219, 69%, 72%)
CMYK	cmyk(69%, 44.6%, 0%, 27.8%)
CIE-LAB	lab(43.99, 12.14, -47.95)
CIE-LCH	lch(43.99, 49.46, 284.21°)
OKLab	oklab(52.11% -0.021 -0.1371)
OKLCH	oklch(52.11% 0.139 261.3)
XYZ	xyz(15.0874, 13.8318, 47.2128)
Luminance	0.1383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3966B8 #B88B39

analogous

#39A6B8 #3966B8 #4B39B8

triadic

#3966B8 #B83966 #66B839

tetradic

#3966B8 #B839A6 #B88B39 #39B84B

square

#3966B8 #B839A6 #B88B39 #39B84B

split-complementary

#3966B8 #B84B39 #A6B839

monochromatic

#1C325B #2B4C89 #3966B8 #6087CE #8FAADC

Accessibility & contrast

On white

5.58

#3966B8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.77

#3966B8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3966B8

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3966B8	#FFFFFF	#000000	##FFFFFF
##3966B8	1.00	5.58	3.77	5.58
#FFFFFF	5.58	1.00	21.00	1.00
#000000	3.77	21.00	1.00	21.00
##FFFFFF	5.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E6EBB

Deuteranopia (green-blind)

#2763B6

Tritanopia (blue-blind)

#007986

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3966b8;
/* rgb */ color: rgb(57, 102, 184);
/* oklch */ color: oklch(52.1% 0.139 261.3);

Tailwind

colors: {
  custom: {
    50: '#7e91ce',
    500: '#3966b8',
    950: '#000000',
  },
}

SCSS

$custom: #3966b8;
$custom-light: #7e91ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3966b8",
  "rgb": {
    "r": 57,
    "g": 102,
    "b": 184
  },
  "hsl": {
    "h": 218.74,
    "s": 52.697,
    "l": 47.255
  },
  "oklch": {
    "l": 0.52106,
    "c": 0.13871,
    "h": 261.3
  },
  "luminance": 0.13833
}

Semantic roles & 50–950 ramp

primary

#3966B8

secondary

#C7B086

accent

#A94CDC

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3966B8

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

Preview Lab → · Contrast checker → · Palette generator →