#3F45BC#3F45BC

#3F45BC is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.2% C 0.183 H 274.4°. Best body text is #FFFFFF at 7.53:1 contrast (WCAG AA passes).

Color values

HEX	#3F45BC
RGB	rgb(63, 69, 188)
HSL	hsl(237, 50%, 49%)
HSV	hsv(237, 66%, 74%)
CMYK	cmyk(66.5%, 63.3%, 0%, 26.3%)
CIE-LAB	lab(35.87, 35.68, -63.40)
CIE-LCH	lch(35.87, 72.75, 299.37°)
OKLab	oklab(46.17% 0.0141 -0.1829)
OKLCH	oklch(46.17% 0.183 274.4)
XYZ	xyz(13.2521, 8.9427, 48.5949)
Luminance	0.0894 (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

#3F45BC #BCB63F

analogous

#3F84BC #3F45BC #783FBC

triadic

#3F45BC #BC3F45 #45BC3F

tetradic

#3F45BC #BC3F84 #BCB63F #3FBC78

square

#3F45BC #BC3F84 #BCB63F #3FBC78

split-complementary

#3F45BC #BC783F #84BC3F

monochromatic

#202360 #30348E #3F45BC #6B70CD #999CDD

Accessibility & contrast

On white

7.53

#3F45BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.79

#3F45BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45BC

7.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45BC	#FFFFFF	#000000	##FFFFFF
##3F45BC	1.00	7.53	2.79	7.53
#FFFFFF	7.53	1.00	21.00	1.00
#000000	2.79	21.00	1.00	21.00
##FFFFFF	7.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AC0

Deuteranopia (green-blind)

#004FBA

Tritanopia (blue-blind)

#00637A

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f45bc;
/* rgb */ color: rgb(63, 69, 188);
/* oklch */ color: oklch(46.2% 0.183 274.4);

Tailwind

colors: {
  custom: {
    50: '#8379d1',
    500: '#3f45bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f45bc;
$custom-light: #8379d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45bc",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 188
  },
  "hsl": {
    "h": 237.12,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.46166,
    "c": 0.1834,
    "h": 274.4
  },
  "luminance": 0.08944
}

Semantic roles & 50–950 ramp

primary

#3F45BC

secondary

#C9C68E

accent

#D34ED9

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0914

muted

#7D7B83

Preview Lab

Preview with #3F45BC

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

Preview Lab → · Contrast checker → · Palette generator →