#3F41B2#3F41B2

#3F41B2 is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.6% C 0.175 H 275.9°. Best body text is #FFFFFF at 8.04:1 contrast (WCAG AA passes).

Color values

HEX	#3F41B2
RGB	rgb(63, 65, 178)
HSL	hsl(239, 48%, 47%)
HSV	hsv(239, 65%, 70%)
CMYK	cmyk(64.6%, 63.5%, 0%, 30.2%)
CIE-LAB	lab(34.09, 34.75, -60.41)
CIE-LCH	lch(34.09, 69.70, 299.91°)
OKLab	oklab(44.6% 0.0179 -0.1741)
OKLCH	oklch(44.6% 0.175 275.9)
XYZ	xyz(11.9734, 8.0507, 43.0338)
Luminance	0.0805 (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

#3F41B2 #B2B03F

analogous

#3F7AB2 #3F41B2 #773FB2

triadic

#3F41B2 #B23F41 #41B23F

tetradic

#3F41B2 #B23F7A #B2B03F #3FB277

square

#3F41B2 #B23F7A #B2B03F #3FB277

split-complementary

#3F41B2 #B2773F #7AB23F

monochromatic

#1F2058 #2F3085 #3F41B2 #6667C9 #9394D9

Accessibility & contrast

On white

8.04

#3F41B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.61

#3F41B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41B2

8.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41B2	#FFFFFF	#000000	##FFFFFF
##3F41B2	1.00	8.04	2.61	8.04
#FFFFFF	8.04	1.00	21.00	1.00
#000000	2.61	21.00	1.00	21.00
##FFFFFF	8.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055B6

Deuteranopia (green-blind)

#004BB0

Tritanopia (blue-blind)

#005E73

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f41b2;
/* rgb */ color: rgb(63, 65, 178);
/* oklch */ color: oklch(44.6% 0.175 275.9);

Tailwind

colors: {
  custom: {
    50: '#8176ca',
    500: '#3f41b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f41b2;
$custom-light: #8176ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41b2",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 178
  },
  "hsl": {
    "h": 238.957,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.44599,
    "c": 0.17503,
    "h": 275.9
  },
  "luminance": 0.08052
}

Semantic roles & 50–950 ramp

primary

#3F41B2

secondary

#C4C389

accent

#D550D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0C0813

muted

#7D7B82

Preview Lab

Preview with #3F41B2

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

Preview Lab → · Contrast checker → · Palette generator →