#3F41B8#3F41B8

#3F41B8 is a mid, vivid blue. Relative luminance 0.083; OKLCH L 45.1% C 0.183 H 275.5°. Best body text is #FFFFFF at 7.90:1 contrast (WCAG AA passes).

Color values

HEX	#3F41B8
RGB	rgb(63, 65, 184)
HSL	hsl(239, 49%, 48%)
HSV	hsv(239, 66%, 72%)
CMYK	cmyk(65.8%, 64.7%, 0%, 27.8%)
CIE-LAB	lab(34.59, 36.79, -63.14)
CIE-LCH	lch(34.59, 73.08, 300.23°)
OKLab	oklab(45.13% 0.0175 -0.1821)
OKLCH	oklch(45.13% 0.183 275.5)
XYZ	xyz(12.5891, 8.2970, 46.2762)
Luminance	0.0830 (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

#3F41B8 #B8B63F

analogous

#3F7DB8 #3F41B8 #793FB8

triadic

#3F41B8 #B83F41 #41B83F

tetradic

#3F41B8 #B83F7D #B8B63F #3FB879

square

#3F41B8 #B83F7D #B8B63F #3FB879

split-complementary

#3F41B8 #B8793F #7DB83F

monochromatic

#20215D #2F318A #3F41B8 #696ACC #9697DB

Accessibility & contrast

On white

7.90

#3F41B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.66

#3F41B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41B8

7.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41B8	#FFFFFF	#000000	##FFFFFF
##3F41B8	1.00	7.90	2.66	7.90
#FFFFFF	7.90	1.00	21.00	1.00
#000000	2.66	21.00	1.00	21.00
##FFFFFF	7.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057BC

Deuteranopia (green-blind)

#004CB6

Tritanopia (blue-blind)

#006076

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f41b8;
/* rgb */ color: rgb(63, 65, 184);
/* oklch */ color: oklch(45.1% 0.183 275.5);

Tailwind

colors: {
  custom: {
    50: '#8376ce',
    500: '#3f41b8',
    950: '#000000',
  },
}

SCSS

$custom: #3f41b8;
$custom-light: #8376ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41b8",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 184
  },
  "hsl": {
    "h": 239.008,
    "s": 48.988,
    "l": 48.431
  },
  "oklch": {
    "l": 0.45125,
    "c": 0.18295,
    "h": 275.5
  },
  "luminance": 0.08298
}

Semantic roles & 50–950 ramp

primary

#3F41B8

secondary

#C7C68C

accent

#D64FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F41B8

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

Preview Lab → · Contrast checker → · Palette generator →