#3F51BA#3F51BA

#3F51BA is a mid, vivid blue. Relative luminance 0.105; OKLCH L 48.2% C 0.166 H 271.4°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F51BA
RGB	rgb(63, 81, 186)
HSL	hsl(231, 49%, 49%)
HSV	hsv(231, 66%, 73%)
CMYK	cmyk(66.1%, 56.5%, 0%, 27.1%)
CIE-LAB	lab(38.70, 27.35, -57.63)
CIE-LCH	lch(38.70, 63.79, 295.39°)
OKLab	oklab(48.21% 0.0041 -0.1658)
OKLCH	oklch(48.21% 0.166 271.4)
XYZ	xyz(13.8523, 10.4855, 47.7388)
Luminance	0.1049 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51BA #BAA83F

analogous

#3F8FBA #3F51BA #6B3FBA

triadic

#3F51BA #BA3F51 #51BA3F

tetradic

#3F51BA #BA3F8F #BAA83F #3FBA6B

square

#3F51BA #BA3F8F #BAA83F #3FBA6B

split-complementary

#3F51BA #BA6B3F #8FBA3F

monochromatic

#20295F #303D8C #3F51BA #6A78CC #97A1DC

Accessibility & contrast

On white

6.78

#3F51BA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#3F51BA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51BA

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51BA	#FFFFFF	#000000	##FFFFFF
##3F51BA	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061BE

Deuteranopia (green-blind)

#0056B8

Tritanopia (blue-blind)

#006A7D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f51ba;
/* rgb */ color: rgb(63, 81, 186);
/* oklch */ color: oklch(48.2% 0.166 271.4);

Tailwind

colors: {
  custom: {
    50: '#8281cf',
    500: '#3f51ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f51ba;
$custom-light: #8281cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51ba",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 186
  },
  "hsl": {
    "h": 231.22,
    "s": 49.398,
    "l": 48.824
  },
  "oklch": {
    "l": 0.4821,
    "c": 0.16583,
    "h": 271.4
  },
  "luminance": 0.10487
}

Semantic roles & 50–950 ramp

primary

#3F51BA

secondary

#C8BF8D

accent

#C54FD9

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F51BA

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

Preview Lab → · Contrast checker → · Palette generator →