#3F45BB#3F45BB

#3F45BB is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.1% C 0.182 H 274.5°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BB
RGB	rgb(63, 69, 187)
HSL	hsl(237, 50%, 49%)
HSV	hsv(237, 66%, 73%)
CMYK	cmyk(66.3%, 63.1%, 0%, 26.7%)
CIE-LAB	lab(35.79, 35.33, -62.95)
CIE-LCH	lch(35.79, 72.19, 299.30°)
OKLab	oklab(46.08% 0.0141 -0.1815)
OKLCH	oklch(46.08% 0.182 274.5)
XYZ	xyz(13.1447, 8.8997, 48.0292)
Luminance	0.0890 (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

#3F45BB #BBB53F

analogous

#3F83BB #3F45BB #773FBB

triadic

#3F45BB #BB3F45 #45BB3F

tetradic

#3F45BB #BB3F83 #BBB53F #3FBB77

square

#3F45BB #BB3F83 #BBB53F #3FBB77

split-complementary

#3F45BB #BB773F #83BB3F

monochromatic

#20235F #30348D #3F45BB #6A6FCD #989BDC

Accessibility & contrast

On white

7.55

#3F45BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3F45BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BB

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BB	#FFFFFF	#000000	##FFFFFF
##3F45BB	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ABF

Deuteranopia (green-blind)

#004FB9

Tritanopia (blue-blind)

#006379

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f45bb;
/* rgb */ color: rgb(63, 69, 187);
/* oklch */ color: oklch(46.1% 0.182 274.5);

Tailwind

colors: {
  custom: {
    50: '#8379d0',
    500: '#3f45bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f45bb;
$custom-light: #8379d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45bb",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 187
  },
  "hsl": {
    "h": 237.097,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.46079,
    "c": 0.18208,
    "h": 274.5
  },
  "luminance": 0.08901
}

Semantic roles & 50–950 ramp

primary

#3F45BB

secondary

#C8C58E

accent

#D24FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #3F45BB

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

Preview Lab → · Contrast checker → · Palette generator →