#3F45BA#3F45BA

#3F45BA is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.0% C 0.181 H 274.5°. Best body text is #FFFFFF at 7.58:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BA
RGB	rgb(63, 69, 186)
HSL	hsl(237, 49%, 49%)
HSV	hsv(237, 66%, 73%)
CMYK	cmyk(66.1%, 62.9%, 0%, 27.1%)
CIE-LAB	lab(35.71, 34.99, -62.50)
CIE-LCH	lch(35.71, 71.63, 299.24°)
OKLab	oklab(45.99% 0.0142 -0.1802)
OKLCH	oklch(45.99% 0.181 274.5)
XYZ	xyz(13.0380, 8.8570, 47.4673)
Luminance	0.0886 (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

#3F45BA #BAB43F

analogous

#3F83BA #3F45BA #773FBA

triadic

#3F45BA #BA3F45 #45BA3F

tetradic

#3F45BA #BA3F83 #BAB43F #3FBA77

square

#3F45BA #BA3F83 #BAB43F #3FBA77

split-complementary

#3F45BA #BA773F #83BA3F

monochromatic

#20235F #30348C #3F45BA #6A6FCC #979BDC

Accessibility & contrast

On white

7.58

#3F45BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.77

#3F45BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BA

7.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BA	#FFFFFF	#000000	##FFFFFF
##3F45BA	1.00	7.58	2.77	7.58
#FFFFFF	7.58	1.00	21.00	1.00
#000000	2.77	21.00	1.00	21.00
##FFFFFF	7.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ABE

Deuteranopia (green-blind)

#004FB8

Tritanopia (blue-blind)

#006379

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f45ba;
/* rgb */ color: rgb(63, 69, 186);
/* oklch */ color: oklch(46.0% 0.181 274.5);

Tailwind

colors: {
  custom: {
    50: '#8379d0',
    500: '#3f45ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f45ba;
$custom-light: #8379d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45ba",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 186
  },
  "hsl": {
    "h": 237.073,
    "s": 49.398,
    "l": 48.824
  },
  "oklch": {
    "l": 0.45992,
    "c": 0.18076,
    "h": 274.5
  },
  "luminance": 0.08858
}

Semantic roles & 50–950 ramp

primary

#3F45BA

secondary

#C8C58D

accent

#D24FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #3F45BA

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

Preview Lab → · Contrast checker → · Palette generator →