#3F41BB#3F41BB

#3F41BB is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.4% C 0.187 H 275.3°. Best body text is #FFFFFF at 7.82:1 contrast (WCAG AA passes).

Color values

HEX	#3F41BB
RGB	rgb(63, 65, 187)
HSL	hsl(239, 50%, 49%)
HSV	hsv(239, 66%, 73%)
CMYK	cmyk(66.3%, 65.2%, 0%, 26.7%)
CIE-LAB	lab(34.85, 37.81, -64.49)
CIE-LCH	lch(34.85, 74.76, 300.39°)
OKLab	oklab(45.39% 0.0172 -0.1861)
OKLCH	oklch(45.39% 0.187 275.3)
XYZ	xyz(12.9069, 8.4241, 47.9499)
Luminance	0.0843 (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

#3F41BB #BBB93F

analogous

#3F7FBB #3F41BB #7B3FBB

triadic

#3F41BB #BB3F41 #41BB3F

tetradic

#3F41BB #BB3F7F #BBB93F #3FBB7B

square

#3F41BB #BB3F7F #BBB93F #3FBB7B

split-complementary

#3F41BB #BB7B3F #7FBB3F

monochromatic

#20215F #30318D #3F41BB #6A6CCD #9899DC

Accessibility & contrast

On white

7.82

#3F41BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.69

#3F41BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41BB

7.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41BB	#FFFFFF	#000000	##FFFFFF
##3F41BB	1.00	7.82	2.69	7.82
#FFFFFF	7.82	1.00	21.00	1.00
#000000	2.69	21.00	1.00	21.00
##FFFFFF	7.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058BF

Deuteranopia (green-blind)

#004CB9

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f41bb;
/* rgb */ color: rgb(63, 65, 187);
/* oklch */ color: oklch(45.4% 0.187 275.3);

Tailwind

colors: {
  custom: {
    50: '#8376d0',
    500: '#3f41bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f41bb;
$custom-light: #8376d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41bb",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 187
  },
  "hsl": {
    "h": 239.032,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.45392,
    "c": 0.18686,
    "h": 275.3
  },
  "luminance": 0.08425
}

Semantic roles & 50–950 ramp

primary

#3F41BB

secondary

#C8C78E

accent

#D74FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F41BB

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

Preview Lab → · Contrast checker → · Palette generator →