#3F45C5#3F45C5

#3F45C5 is a mid, vivid blue. Relative luminance 0.093; OKLCH L 47.0% C 0.195 H 273.9°. Best body text is #FFFFFF at 7.32:1 contrast (WCAG AA passes).

Color values

HEX	#3F45C5
RGB	rgb(63, 69, 197)
HSL	hsl(237, 54%, 51%)
HSV	hsv(237, 68%, 77%)
CMYK	cmyk(68%, 65%, 0%, 22.7%)
CIE-LAB	lab(36.64, 38.76, -67.43)
CIE-LCH	lch(36.64, 77.77, 299.89°)
OKLab	oklab(46.96% 0.0134 -0.1946)
OKLCH	oklch(46.96% 0.195 273.9)
XYZ	xyz(14.2527, 9.3429, 53.8647)
Luminance	0.0934 (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

#3F45C5 #C5BF3F

analogous

#3F88C5 #3F45C5 #7C3FC5

triadic

#3F45C5 #C53F45 #45C53F

tetradic

#3F45C5 #C53F88 #C5BF3F #3FC57C

square

#3F45C5 #C53F88 #C5BF3F #3FC57C

split-complementary

#3F45C5 #C57C3F #88C53F

monochromatic

#20236A #2E3399 #3F45C5 #6E73D3 #9DA0E1

Accessibility & contrast

On white

7.32

#3F45C5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.87

#3F45C5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45C5

7.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45C5	#FFFFFF	#000000	##FFFFFF
##3F45C5	1.00	7.32	2.87	7.32
#FFFFFF	7.32	1.00	21.00	1.00
#000000	2.87	21.00	1.00	21.00
##FFFFFF	7.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CC9

Deuteranopia (green-blind)

#0050C3

Tritanopia (blue-blind)

#00667F

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f45c5;
/* rgb */ color: rgb(63, 69, 197);
/* oklch */ color: oklch(47.0% 0.195 273.9);

Tailwind

colors: {
  custom: {
    50: '#8579d8',
    500: '#3f45c5',
    950: '#000000',
  },
}

SCSS

$custom: #3f45c5;
$custom-light: #8579d8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45c5",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 197
  },
  "hsl": {
    "h": 237.313,
    "s": 53.6,
    "l": 50.98
  },
  "oklch": {
    "l": 0.46959,
    "c": 0.19511,
    "h": 273.9
  },
  "luminance": 0.09344
}

Semantic roles & 50–950 ramp

primary

#3F45C5

secondary

#CECB92

accent

#D64BDD

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0915

muted

#7D7B83

Preview Lab

Preview with #3F45C5

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

Preview Lab → · Contrast checker → · Palette generator →