#3F42C1#3F42C1

#3F42C1 is a mid, vivid blue. Relative luminance 0.088; OKLCH L 46.1% C 0.193 H 274.7°. Best body text is #FFFFFF at 7.61:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C1
RGB	rgb(63, 66, 193)
HSL	hsl(239, 51%, 50%)
HSV	hsv(239, 67%, 76%)
CMYK	cmyk(67.4%, 65.8%, 0%, 24.3%)
CIE-LAB	lab(35.60, 39.23, -66.78)
CIE-LCH	lch(35.60, 77.46, 300.43°)
OKLab	oklab(46.1% 0.016 -0.1928)
OKLCH	oklch(46.1% 0.193 274.7)
XYZ	xyz(13.6206, 8.8022, 51.4229)
Luminance	0.0880 (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

#3F42C1 #C1BE3F

analogous

#3F83C1 #3F42C1 #7D3FC1

triadic

#3F42C1 #C13F42 #42C13F

tetradic

#3F42C1 #C13F83 #C1BE3F #3FC17D

square

#3F42C1 #C13F83 #C1BE3F #3FC17D

split-complementary

#3F42C1 #C17D3F #83C13F

monochromatic

#212265 #303293 #3F42C1 #6D70D0 #9C9DDF

Accessibility & contrast

On white

7.61

#3F42C1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.76

#3F42C1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C1

7.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C1	#FFFFFF	#000000	##FFFFFF
##3F42C1	1.00	7.61	2.76	7.61
#FFFFFF	7.61	1.00	21.00	1.00
#000000	2.76	21.00	1.00	21.00
##FFFFFF	7.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AC5

Deuteranopia (green-blind)

#004EBF

Tritanopia (blue-blind)

#00637C

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f42c1;
/* rgb */ color: rgb(63, 66, 193);
/* oklch */ color: oklch(46.1% 0.193 274.7);

Tailwind

colors: {
  custom: {
    50: '#8477d5',
    500: '#3f42c1',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c1;
$custom-light: #8477d5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c1",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 193
  },
  "hsl": {
    "h": 238.615,
    "s": 51.181,
    "l": 50.196
  },
  "oklch": {
    "l": 0.46098,
    "c": 0.19344,
    "h": 274.7
  },
  "luminance": 0.08803
}

Semantic roles & 50–950 ramp

primary

#3F42C1

secondary

#CBCA91

accent

#D74DDB

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F42C1

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

Preview Lab → · Contrast checker → · Palette generator →