#3F47BB#3F47BB

#3F47BB is a mid, vivid blue. Relative luminance 0.092; OKLCH L 46.4% C 0.180 H 274.0°. Best body text is #FFFFFF at 7.42:1 contrast (WCAG AA passes).

Color values

HEX	#3F47BB
RGB	rgb(63, 71, 187)
HSL	hsl(236, 50%, 49%)
HSV	hsv(236, 66%, 73%)
CMYK	cmyk(66.3%, 62%, 0%, 26.7%)
CIE-LAB	lab(36.27, 34.08, -62.17)
CIE-LCH	lch(36.27, 70.89, 298.73°)
OKLab	oklab(46.43% 0.0125 -0.1792)
OKLCH	oklch(46.43% 0.18 274)
XYZ	xyz(13.2698, 9.1499, 48.0709)
Luminance	0.0915 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F47BB #BBB33F

analogous

#3F85BB #3F47BB #753FBB

triadic

#3F47BB #BB3F47 #47BB3F

tetradic

#3F47BB #BB3F85 #BBB33F #3FBB75

square

#3F47BB #BB3F85 #BBB33F #3FBB75

split-complementary

#3F47BB #BB753F #85BB3F

monochromatic

#20245F #30368D #3F47BB #6A71CD #989CDC

Accessibility & contrast

On white

7.42

#3F47BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.83

#3F47BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F47BB

7.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F47BB	#FFFFFF	#000000	##FFFFFF
##3F47BB	1.00	7.42	2.83	7.42
#FFFFFF	7.42	1.00	21.00	1.00
#000000	2.83	21.00	1.00	21.00
##FFFFFF	7.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BBF

Deuteranopia (green-blind)

#0050B9

Tritanopia (blue-blind)

#00647A

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f47bb;
/* rgb */ color: rgb(63, 71, 187);
/* oklch */ color: oklch(46.4% 0.180 274.0);

Tailwind

colors: {
  custom: {
    50: '#837ad0',
    500: '#3f47bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f47bb;
$custom-light: #837ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f47bb",
  "rgb": {
    "r": 63,
    "g": 71,
    "b": 187
  },
  "hsl": {
    "h": 236.129,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.46432,
    "c": 0.17966,
    "h": 274
  },
  "luminance": 0.09151
}

Semantic roles & 50–950 ramp

primary

#3F47BB

secondary

#C8C48E

accent

#D04FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #3F47BB

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

Preview Lab → · Contrast checker → · Palette generator →