#3F42C3#3F42C3

#3F42C3 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 46.3% C 0.196 H 274.6°. Best body text is #FFFFFF at 7.56:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C3
RGB	rgb(63, 66, 195)
HSL	hsl(239, 52%, 51%)
HSV	hsv(239, 68%, 76%)
CMYK	cmyk(67.7%, 66.2%, 0%, 23.5%)
CIE-LAB	lab(35.78, 39.91, -67.67)
CIE-LCH	lch(35.78, 78.56, 300.53°)
OKLab	oklab(46.28% 0.0158 -0.1954)
OKLCH	oklch(46.28% 0.196 274.6)
XYZ	xyz(13.8452, 8.8921, 52.6059)
Luminance	0.0889 (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

#3F42C3 #C3C03F

analogous

#3F84C3 #3F42C3 #7E3FC3

triadic

#3F42C3 #C33F42 #42C33F

tetradic

#3F42C3 #C33F84 #C3C03F #3FC37E

square

#3F42C3 #C33F84 #C3C03F #3FC37E

split-complementary

#3F42C3 #C37E3F #84C33F

monochromatic

#202267 #2F3196 #3F42C3 #6E70D2 #9C9EE0

Accessibility & contrast

On white

7.56

#3F42C3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3F42C3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C3

7.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C3	#FFFFFF	#000000	##FFFFFF
##3F42C3	1.00	7.56	2.78	7.56
#FFFFFF	7.56	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AC7

Deuteranopia (green-blind)

#004EC1

Tritanopia (blue-blind)

#00647D

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f42c3;
/* rgb */ color: rgb(63, 66, 195);
/* oklch */ color: oklch(46.3% 0.196 274.6);

Tailwind

colors: {
  custom: {
    50: '#8577d6',
    500: '#3f42c3',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c3;
$custom-light: #8577d6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c3",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 195
  },
  "hsl": {
    "h": 238.636,
    "s": 52.381,
    "l": 50.588
  },
  "oklch": {
    "l": 0.46279,
    "c": 0.196,
    "h": 274.6
  },
  "luminance": 0.08893
}

Semantic roles & 50–950 ramp

primary

#3F42C3

secondary

#CCCB92

accent

#D94CDC

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F42C3

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

Preview Lab → · Contrast checker → · Palette generator →