#3F42C5#3F42C5

#3F42C5 is a mid, vivid blue. Relative luminance 0.090; OKLCH L 46.5% C 0.199 H 274.5°. Best body text is #FFFFFF at 7.51:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C5
RGB	rgb(63, 66, 197)
HSL	hsl(239, 54%, 51%)
HSV	hsv(239, 68%, 77%)
CMYK	cmyk(68%, 66.5%, 0%, 22.7%)
CIE-LAB	lab(35.95, 40.59, -68.55)
CIE-LCH	lch(35.95, 79.66, 300.63°)
OKLab	oklab(46.46% 0.0156 -0.1979)
OKLCH	oklch(46.46% 0.199 274.5)
XYZ	xyz(14.0728, 8.9831, 53.8048)
Luminance	0.0898 (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

#3F42C5 #C5C23F

analogous

#3F85C5 #3F42C5 #7F3FC5

triadic

#3F42C5 #C53F42 #42C53F

tetradic

#3F42C5 #C53F85 #C5C23F #3FC57F

square

#3F42C5 #C53F85 #C5C23F #3FC57F

split-complementary

#3F42C5 #C57F3F #85C53F

monochromatic

#20226A #2E3199 #3F42C5 #6E70D3 #9D9FE1

Accessibility & contrast

On white

7.51

#3F42C5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#3F42C5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C5

7.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C5	#FFFFFF	#000000	##FFFFFF
##3F42C5	1.00	7.51	2.80	7.51
#FFFFFF	7.51	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BC9

Deuteranopia (green-blind)

#004EC3

Tritanopia (blue-blind)

#00657E

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f42c5;
/* rgb */ color: rgb(63, 66, 197);
/* oklch */ color: oklch(46.5% 0.199 274.5);

Tailwind

colors: {
  custom: {
    50: '#8577d8',
    500: '#3f42c5',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c5;
$custom-light: #8577d8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c5",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 197
  },
  "hsl": {
    "h": 238.657,
    "s": 53.6,
    "l": 50.98
  },
  "oklch": {
    "l": 0.46461,
    "c": 0.19856,
    "h": 274.5
  },
  "luminance": 0.08984
}

Semantic roles & 50–950 ramp

primary

#3F42C5

secondary

#CECC92

accent

#DA4BDD

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0815

muted

#7D7B83

Preview Lab

Preview with #3F42C5

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

Preview Lab → · Contrast checker → · Palette generator →