#3F42C4#3F42C4

#3F42C4 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.4% C 0.197 H 274.6°. Best body text is #FFFFFF at 7.53:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C4
RGB	rgb(63, 66, 196)
HSL	hsl(239, 53%, 51%)
HSV	hsv(239, 68%, 77%)
CMYK	cmyk(67.9%, 66.3%, 0%, 23.1%)
CIE-LAB	lab(35.86, 40.25, -68.11)
CIE-LCH	lch(35.86, 79.11, 300.58°)
OKLab	oklab(46.37% 0.0157 -0.1967)
OKLCH	oklch(46.37% 0.197 274.6)
XYZ	xyz(13.9586, 8.9374, 53.2033)
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

#3F42C4 #C4C13F

analogous

#3F84C4 #3F42C4 #7F3FC4

triadic

#3F42C4 #C43F42 #42C43F

tetradic

#3F42C4 #C43F84 #C4C13F #3FC47F

square

#3F42C4 #C43F84 #C4C13F #3FC47F

split-complementary

#3F42C4 #C47F3F #84C43F

monochromatic

#202268 #2E3197 #3F42C4 #6E70D2 #9D9EE1

Accessibility & contrast

On white

7.53

#3F42C4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.79

#3F42C4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C4

7.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C4	#FFFFFF	#000000	##FFFFFF
##3F42C4	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)

#005AC8

Deuteranopia (green-blind)

#004EC2

Tritanopia (blue-blind)

#00647D

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f42c4;
/* rgb */ color: rgb(63, 66, 196);
/* oklch */ color: oklch(46.4% 0.197 274.6);

Tailwind

colors: {
  custom: {
    50: '#8577d7',
    500: '#3f42c4',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c4;
$custom-light: #8577d7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c4",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 196
  },
  "hsl": {
    "h": 238.647,
    "s": 52.988,
    "l": 50.784
  },
  "oklch": {
    "l": 0.4637,
    "c": 0.19728,
    "h": 274.6
  },
  "luminance": 0.08939
}

Semantic roles & 50–950 ramp

primary

#3F42C4

secondary

#CDCC92

accent

#D94BDC

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0815

muted

#7D7B83

Preview Lab

Preview with #3F42C4

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

Preview Lab → · Contrast checker → · Palette generator →