#3F66BD#3F66BD

#3F66BD is a mid, vivid blue. Relative luminance 0.142; OKLCH L 52.7% C 0.144 H 264.0°. Best body text is #FFFFFF at 5.46:1 contrast (WCAG AA passes).

Color values

HEX	#3F66BD
RGB	rgb(63, 102, 189)
HSL	hsl(221, 50%, 49%)
HSV	hsv(221, 67%, 74%)
CMYK	cmyk(66.7%, 46%, 0%, 25.9%)
CIE-LAB	lab(44.56, 14.93, -49.92)
CIE-LCH	lch(44.56, 52.10, 286.65°)
OKLab	oklab(52.72% -0.0151 -0.1428)
OKLCH	oklch(52.72% 0.144 264)
XYZ	xyz(15.9834, 14.2321, 50.0390)
Luminance	0.1423 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66BD #BD963F

analogous

#3FA5BD #3F66BD #573FBD

triadic

#3F66BD #BD3F66 #66BD3F

tetradic

#3F66BD #BD3FA5 #BD963F #3FBD57

square

#3F66BD #BD3FA5 #BD963F #3FBD57

split-complementary

#3F66BD #BD573F #A5BD3F

monochromatic

#203461 #304D8F #3F66BD #6B8ACE #99AEDD

Accessibility & contrast

On white

5.46

#3F66BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.85

#3F66BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66BD

5.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66BD	#FFFFFF	#000000	##FFFFFF
##3F66BD	1.00	5.46	3.85	5.46
#FFFFFF	5.46	1.00	21.00	1.00
#000000	3.85	21.00	1.00	21.00
##FFFFFF	5.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B70C0

Deuteranopia (green-blind)

#2364BB

Tritanopia (blue-blind)

#007A88

Achromatopsia (no color)

#696969

Design tokens & code

CSS

--color: #3f66bd;
/* rgb */ color: rgb(63, 102, 189);
/* oklch */ color: oklch(52.7% 0.144 264.0);

Tailwind

colors: {
  custom: {
    50: '#8191d1',
    500: '#3f66bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f66bd;
$custom-light: #8191d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66bd",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 189
  },
  "hsl": {
    "h": 221.429,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.52718,
    "c": 0.14359,
    "h": 264
  },
  "luminance": 0.14234
}

Semantic roles & 50–950 ramp

primary

#3F66BD

secondary

#C9B78F

accent

#AE4EDA

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3F66BD

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

Preview Lab → · Contrast checker → · Palette generator →