#3F42B8#3F42B8

#3F42B8 is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.3% C 0.182 H 275.3°. Best body text is #FFFFFF at 7.83:1 contrast (WCAG AA passes).

Color values

HEX	#3F42B8
RGB	rgb(63, 66, 184)
HSL	hsl(239, 49%, 48%)
HSV	hsv(239, 66%, 72%)
CMYK	cmyk(65.8%, 64.1%, 0%, 27.8%)
CIE-LAB	lab(34.83, 36.17, -62.76)
CIE-LCH	lch(34.83, 72.44, 299.96°)
OKLab	oklab(45.3% 0.0167 -0.181)
OKLCH	oklch(45.3% 0.182 275.3)
XYZ	xyz(12.6470, 8.4128, 46.2955)
Luminance	0.0841 (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

#3F42B8 #B8B53F

analogous

#3F7EB8 #3F42B8 #783FB8

triadic

#3F42B8 #B83F42 #42B83F

tetradic

#3F42B8 #B83F7E #B8B53F #3FB878

square

#3F42B8 #B83F7E #B8B53F #3FB878

split-complementary

#3F42B8 #B8783F #7EB83F

monochromatic

#20215D #2F328A #3F42B8 #696BCC #9698DB

Accessibility & contrast

On white

7.83

#3F42B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#3F42B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42B8

7.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42B8	#FFFFFF	#000000	##FFFFFF
##3F42B8	1.00	7.83	2.68	7.83
#FFFFFF	7.83	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057BC

Deuteranopia (green-blind)

#004DB6

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f42b8;
/* rgb */ color: rgb(63, 66, 184);
/* oklch */ color: oklch(45.3% 0.182 275.3);

Tailwind

colors: {
  custom: {
    50: '#8377ce',
    500: '#3f42b8',
    950: '#000000',
  },
}

SCSS

$custom: #3f42b8;
$custom-light: #8377ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42b8",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 184
  },
  "hsl": {
    "h": 238.512,
    "s": 48.988,
    "l": 48.431
  },
  "oklch": {
    "l": 0.45296,
    "c": 0.18175,
    "h": 275.3
  },
  "luminance": 0.08414
}

Semantic roles & 50–950 ramp

primary

#3F42B8

secondary

#C7C58C

accent

#D54FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F42B8

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

Preview Lab → · Contrast checker → · Palette generator →