#3F42C0#3F42C0

#3F42C0 is a mid, vivid blue. Relative luminance 0.088; OKLCH L 46.0% C 0.192 H 274.8°. Best body text is #FFFFFF at 7.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C0
RGB	rgb(63, 66, 192)
HSL	hsl(239, 51%, 50%)
HSV	hsv(239, 67%, 75%)
CMYK	cmyk(67.2%, 65.6%, 0%, 24.7%)
CIE-LAB	lab(35.51, 38.90, -66.34)
CIE-LCH	lch(35.51, 76.90, 300.38°)
OKLab	oklab(46.01% 0.016 -0.1915)
OKLCH	oklch(46.01% 0.192 274.8)
XYZ	xyz(13.5094, 8.7577, 50.8374)
Luminance	0.0876 (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

#3F42C0 #C0BD3F

analogous

#3F82C0 #3F42C0 #7D3FC0

triadic

#3F42C0 #C03F42 #42C03F

tetradic

#3F42C0 #C03F82 #C0BD3F #3FC07D

square

#3F42C0 #C03F82 #C0BD3F #3FC07D

split-complementary

#3F42C0 #C07D3F #82C03F

monochromatic

#212264 #303292 #3F42C0 #6D6FCF #9B9DDE

Accessibility & contrast

On white

7.63

#3F42C0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.75

#3F42C0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C0

7.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C0	#FFFFFF	#000000	##FFFFFF
##3F42C0	1.00	7.63	2.75	7.63
#FFFFFF	7.63	1.00	21.00	1.00
#000000	2.75	21.00	1.00	21.00
##FFFFFF	7.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059C4

Deuteranopia (green-blind)

#004EBE

Tritanopia (blue-blind)

#00637B

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f42c0;
/* rgb */ color: rgb(63, 66, 192);
/* oklch */ color: oklch(46.0% 0.192 274.8);

Tailwind

colors: {
  custom: {
    50: '#8477d4',
    500: '#3f42c0',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c0;
$custom-light: #8477d4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c0",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 192
  },
  "hsl": {
    "h": 238.605,
    "s": 50.588,
    "l": 50
  },
  "oklch": {
    "l": 0.46008,
    "c": 0.19215,
    "h": 274.8
  },
  "luminance": 0.08759
}

Semantic roles & 50–950 ramp

primary

#3F42C0

secondary

#CAC991

accent

#D74EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F42C0

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

Preview Lab → · Contrast checker → · Palette generator →