#3F45BE#3F45BE

#3F45BE is a mid, vivid blue. Relative luminance 0.090; OKLCH L 46.3% C 0.186 H 274.3°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BE
RGB	rgb(63, 69, 190)
HSL	hsl(237, 50%, 50%)
HSV	hsv(237, 67%, 75%)
CMYK	cmyk(66.8%, 63.7%, 0%, 25.5%)
CIE-LAB	lab(36.04, 36.36, -64.30)
CIE-LCH	lch(36.04, 73.87, 299.49°)
OKLab	oklab(46.34% 0.014 -0.1855)
OKLCH	oklch(46.34% 0.186 274.3)
XYZ	xyz(13.4692, 9.0295, 49.7383)
Luminance	0.0903 (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

#3F45BE #BEB83F

analogous

#3F85BE #3F45BE #783FBE

triadic

#3F45BE #BE3F45 #45BE3F

tetradic

#3F45BE #BE3F85 #BEB83F #3FBE78

square

#3F45BE #BE3F85 #BEB83F #3FBE78

split-complementary

#3F45BE #BE783F #85BE3F

monochromatic

#212462 #303490 #3F45BE #6C71CE #9A9DDD

Accessibility & contrast

On white

7.48

#3F45BE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#3F45BE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BE

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BE	#FFFFFF	#000000	##FFFFFF
##3F45BE	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BC2

Deuteranopia (green-blind)

#004FBC

Tritanopia (blue-blind)

#00647B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f45be;
/* rgb */ color: rgb(63, 69, 190);
/* oklch */ color: oklch(46.3% 0.186 274.3);

Tailwind

colors: {
  custom: {
    50: '#8479d3',
    500: '#3f45be',
    950: '#000000',
  },
}

SCSS

$custom: #3f45be;
$custom-light: #8479d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45be",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 190
  },
  "hsl": {
    "h": 237.165,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.4634,
    "c": 0.18602,
    "h": 274.3
  },
  "luminance": 0.09031
}

Semantic roles & 50–950 ramp

primary

#3F45BE

secondary

#C9C78F

accent

#D34EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0914

muted

#7D7B83

Preview Lab

Preview with #3F45BE

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

Preview Lab → · Contrast checker → · Palette generator →