#3F41B7#3F41B7

#3F41B7 is a mid, vivid blue. Relative luminance 0.083; OKLCH L 45.0% C 0.182 H 275.6°. Best body text is #FFFFFF at 7.92:1 contrast (WCAG AA passes).

Color values

HEX	#3F41B7
RGB	rgb(63, 65, 183)
HSL	hsl(239, 49%, 48%)
HSV	hsv(239, 66%, 72%)
CMYK	cmyk(65.6%, 64.5%, 0%, 28.2%)
CIE-LAB	lab(34.51, 36.45, -62.69)
CIE-LCH	lch(34.51, 72.52, 300.18°)
OKLab	oklab(45.04% 0.0176 -0.1808)
OKLCH	oklch(45.04% 0.182 275.6)
XYZ	xyz(12.4846, 8.2552, 45.7261)
Luminance	0.0826 (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

#3F41B7 #B7B53F

analogous

#3F7DB7 #3F41B7 #793FB7

triadic

#3F41B7 #B73F41 #41B73F

tetradic

#3F41B7 #B73F7D #B7B53F #3FB779

square

#3F41B7 #B73F7D #B7B53F #3FB779

split-complementary

#3F41B7 #B7793F #7DB73F

monochromatic

#20215C #2F3189 #3F41B7 #686ACB #9697DB

Accessibility & contrast

On white

7.92

#3F41B7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.65

#3F41B7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41B7

7.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41B7	#FFFFFF	#000000	##FFFFFF
##3F41B7	1.00	7.92	2.65	7.92
#FFFFFF	7.92	1.00	21.00	1.00
#000000	2.65	21.00	1.00	21.00
##FFFFFF	7.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057BB

Deuteranopia (green-blind)

#004CB5

Tritanopia (blue-blind)

#005F76

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f41b7;
/* rgb */ color: rgb(63, 65, 183);
/* oklch */ color: oklch(45.0% 0.182 275.6);

Tailwind

colors: {
  custom: {
    50: '#8276ce',
    500: '#3f41b7',
    950: '#000000',
  },
}

SCSS

$custom: #3f41b7;
$custom-light: #8276ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41b7",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 183
  },
  "hsl": {
    "h": 239,
    "s": 48.78,
    "l": 48.235
  },
  "oklch": {
    "l": 0.45037,
    "c": 0.18163,
    "h": 275.6
  },
  "luminance": 0.08256
}

Semantic roles & 50–950 ramp

primary

#3F41B7

secondary

#C6C58B

accent

#D64FD8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F41B7

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

Preview Lab → · Contrast checker → · Palette generator →