#3F41B3#3F41B3

#3F41B3 is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.7% C 0.176 H 275.8°. Best body text is #FFFFFF at 8.02:1 contrast (WCAG AA passes).

Color values

HEX	#3F41B3
RGB	rgb(63, 65, 179)
HSL	hsl(239, 48%, 47%)
HSV	hsv(239, 65%, 70%)
CMYK	cmyk(64.8%, 63.7%, 0%, 29.8%)
CIE-LAB	lab(34.17, 35.09, -60.87)
CIE-LCH	lch(34.17, 70.26, 299.96°)
OKLab	oklab(44.69% 0.0179 -0.1754)
OKLCH	oklch(44.69% 0.176 275.8)
XYZ	xyz(12.0742, 8.0910, 43.5645)
Luminance	0.0809 (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

#3F41B3 #B3B13F

analogous

#3F7BB3 #3F41B3 #773FB3

triadic

#3F41B3 #B33F41 #41B33F

tetradic

#3F41B3 #B33F7B #B3B13F #3FB377

square

#3F41B3 #B33F7B #B3B13F #3FB377

split-complementary

#3F41B3 #B3773F #7BB33F

monochromatic

#1F2058 #2F3186 #3F41B3 #6668C9 #9395D9

Accessibility & contrast

On white

8.02

#3F41B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#3F41B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41B3

8.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41B3	#FFFFFF	#000000	##FFFFFF
##3F41B3	1.00	8.02	2.62	8.02
#FFFFFF	8.02	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056B7

Deuteranopia (green-blind)

#004BB1

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f41b3;
/* rgb */ color: rgb(63, 65, 179);
/* oklch */ color: oklch(44.7% 0.176 275.8);

Tailwind

colors: {
  custom: {
    50: '#8276cb',
    500: '#3f41b3',
    950: '#000000',
  },
}

SCSS

$custom: #3f41b3;
$custom-light: #8276cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41b3",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 179
  },
  "hsl": {
    "h": 238.966,
    "s": 47.934,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44686,
    "c": 0.17636,
    "h": 275.8
  },
  "luminance": 0.08092
}

Semantic roles & 50–950 ramp

primary

#3F41B3

secondary

#C4C389

accent

#D550D8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0813

muted

#7D7B82

Preview Lab

Preview with #3F41B3

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

Preview Lab → · Contrast checker → · Palette generator →