#3F42BA#3F42BA

#3F42BA is a mid, vivid blue. Relative luminance 0.085; OKLCH L 45.5% C 0.184 H 275.2°. Best body text is #FFFFFF at 7.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F42BA
RGB	rgb(63, 66, 186)
HSL	hsl(239, 49%, 49%)
HSV	hsv(239, 66%, 73%)
CMYK	cmyk(66.1%, 64.5%, 0%, 27.1%)
CIE-LAB	lab(35.00, 36.86, -63.66)
CIE-LCH	lch(35.00, 73.56, 300.07°)
OKLab	oklab(45.47% 0.0166 -0.1836)
OKLCH	oklch(45.47% 0.184 275.2)
XYZ	xyz(12.8581, 8.4972, 47.4074)
Luminance	0.0850 (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

#3F42BA #BAB73F

analogous

#3F80BA #3F42BA #7A3FBA

triadic

#3F42BA #BA3F42 #42BA3F

tetradic

#3F42BA #BA3F80 #BAB73F #3FBA7A

square

#3F42BA #BA3F80 #BAB73F #3FBA7A

split-complementary

#3F42BA #BA7A3F #80BA3F

monochromatic

#20225F #30328C #3F42BA #6A6CCC #9799DC

Accessibility & contrast

On white

7.78

#3F42BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.70

#3F42BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42BA

7.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42BA	#FFFFFF	#000000	##FFFFFF
##3F42BA	1.00	7.78	2.70	7.78
#FFFFFF	7.78	1.00	21.00	1.00
#000000	2.70	21.00	1.00	21.00
##FFFFFF	7.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058BE

Deuteranopia (green-blind)

#004DB8

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f42ba;
/* rgb */ color: rgb(63, 66, 186);
/* oklch */ color: oklch(45.5% 0.184 275.2);

Tailwind

colors: {
  custom: {
    50: '#8377d0',
    500: '#3f42ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f42ba;
$custom-light: #8377d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42ba",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 186
  },
  "hsl": {
    "h": 238.537,
    "s": 49.398,
    "l": 48.824
  },
  "oklch": {
    "l": 0.45473,
    "c": 0.18437,
    "h": 275.2
  },
  "luminance": 0.08498
}

Semantic roles & 50–950 ramp

primary

#3F42BA

secondary

#C8C68D

accent

#D64FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F42BA

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

Preview Lab → · Contrast checker → · Palette generator →