#3F45BD#3F45BD

#3F45BD is a mid, vivid blue. Relative luminance 0.090; OKLCH L 46.3% C 0.185 H 274.4°. Best body text is #FFFFFF at 7.51:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BD
RGB	rgb(63, 69, 189)
HSL	hsl(237, 50%, 49%)
HSV	hsv(237, 67%, 74%)
CMYK	cmyk(66.7%, 63.5%, 0%, 25.9%)
CIE-LAB	lab(35.96, 36.02, -63.85)
CIE-LCH	lch(35.96, 73.31, 299.43°)
OKLab	oklab(46.25% 0.014 -0.1842)
OKLCH	oklch(46.25% 0.185 274.4)
XYZ	xyz(13.3603, 8.9859, 49.1646)
Luminance	0.0899 (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

#3F45BD #BDB73F

analogous

#3F84BD #3F45BD #783FBD

triadic

#3F45BD #BD3F45 #45BD3F

tetradic

#3F45BD #BD3F84 #BDB73F #3FBD78

square

#3F45BD #BD3F84 #BDB73F #3FBD78

split-complementary

#3F45BD #BD783F #84BD3F

monochromatic

#202361 #30348F #3F45BD #6B70CE #999DDD

Accessibility & contrast

On white

7.51

#3F45BD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#3F45BD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BD

7.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BD	#FFFFFF	#000000	##FFFFFF
##3F45BD	1.00	7.51	2.80	7.51
#FFFFFF	7.51	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AC1

Deuteranopia (green-blind)

#004FBB

Tritanopia (blue-blind)

#00647A

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f45bd;
/* rgb */ color: rgb(63, 69, 189);
/* oklch */ color: oklch(46.3% 0.185 274.4);

Tailwind

colors: {
  custom: {
    50: '#8379d2',
    500: '#3f45bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f45bd;
$custom-light: #8379d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45bd",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 189
  },
  "hsl": {
    "h": 237.143,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.46253,
    "c": 0.18471,
    "h": 274.4
  },
  "luminance": 0.08987
}

Semantic roles & 50–950 ramp

primary

#3F45BD

secondary

#C9C68F

accent

#D34EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0914

muted

#7D7B83

Preview Lab

Preview with #3F45BD

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

Preview Lab → · Contrast checker → · Palette generator →