#3F45BF#3F45BF

#3F45BF is a mid, vivid blue. Relative luminance 0.091; OKLCH L 46.4% C 0.187 H 274.3°. Best body text is #FFFFFF at 7.46:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BF
RGB	rgb(63, 69, 191)
HSL	hsl(237, 50%, 50%)
HSV	hsv(237, 67%, 75%)
CMYK	cmyk(67%, 63.9%, 0%, 25.1%)
CIE-LAB	lab(36.13, 36.71, -64.75)
CIE-LCH	lch(36.13, 74.43, 299.55°)
OKLab	oklab(46.43% 0.0139 -0.1868)
OKLCH	oklch(46.43% 0.187 274.3)
XYZ	xyz(13.5789, 9.0734, 50.3159)
Luminance	0.0907 (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

#3F45BF #BFB93F

analogous

#3F85BF #3F45BF #793FBF

triadic

#3F45BF #BF3F45 #45BF3F

tetradic

#3F45BF #BF3F85 #BFB93F #3FBF79

square

#3F45BF #BF3F85 #BFB93F #3FBF79

split-complementary

#3F45BF #BF793F #85BF3F

monochromatic

#212463 #303491 #3F45BF #6D71CF #9B9EDE

Accessibility & contrast

On white

7.46

#3F45BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#3F45BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BF

7.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BF	#FFFFFF	#000000	##FFFFFF
##3F45BF	1.00	7.46	2.81	7.46
#FFFFFF	7.46	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BC3

Deuteranopia (green-blind)

#004FBD

Tritanopia (blue-blind)

#00647B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f45bf;
/* rgb */ color: rgb(63, 69, 191);
/* oklch */ color: oklch(46.4% 0.187 274.3);

Tailwind

colors: {
  custom: {
    50: '#8479d3',
    500: '#3f45bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f45bf;
$custom-light: #8479d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45bf",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 191
  },
  "hsl": {
    "h": 237.188,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.46428,
    "c": 0.18734,
    "h": 274.3
  },
  "luminance": 0.09075
}

Semantic roles & 50–950 ramp

primary

#3F45BF

secondary

#CAC790

accent

#D34EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0914

muted

#7D7B83

Preview Lab

Preview with #3F45BF

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

Preview Lab → · Contrast checker → · Palette generator →