#3F41B0#3F41B0

#3F41B0 is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.4% C 0.172 H 276.0°. Best body text is #FFFFFF at 8.09:1 contrast (WCAG AA passes).

Color values

HEX	#3F41B0
RGB	rgb(63, 65, 176)
HSL	hsl(239, 47%, 47%)
HSV	hsv(239, 64%, 69%)
CMYK	cmyk(64.2%, 63.1%, 0%, 31%)
CIE-LAB	lab(33.92, 34.07, -59.50)
CIE-LCH	lch(33.92, 68.56, 299.79°)
OKLab	oklab(44.43% 0.0181 -0.1714)
OKLCH	oklch(44.43% 0.172 276)
XYZ	xyz(11.7741, 7.9710, 41.9840)
Luminance	0.0797 (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

#3F41B0 #B0AE3F

analogous

#3F7AB0 #3F41B0 #763FB0

triadic

#3F41B0 #B03F41 #41B03F

tetradic

#3F41B0 #B03F7A #B0AE3F #3FB076

square

#3F41B0 #B03F7A #B0AE3F #3FB076

split-complementary

#3F41B0 #B0763F #7AB03F

monochromatic

#1F2056 #2F3083 #3F41B0 #6566C8 #9293D8

Accessibility & contrast

On white

8.09

#3F41B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.59

#3F41B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41B0

8.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41B0	#FFFFFF	#000000	##FFFFFF
##3F41B0	1.00	8.09	2.59	8.09
#FFFFFF	8.09	1.00	21.00	1.00
#000000	2.59	21.00	1.00	21.00
##FFFFFF	8.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055B4

Deuteranopia (green-blind)

#004BAE

Tritanopia (blue-blind)

#005D72

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f41b0;
/* rgb */ color: rgb(63, 65, 176);
/* oklch */ color: oklch(44.4% 0.172 276.0);

Tailwind

colors: {
  custom: {
    50: '#8176c8',
    500: '#3f41b0',
    950: '#000000',
  },
}

SCSS

$custom: #3f41b0;
$custom-light: #8176c8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41b0",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 176
  },
  "hsl": {
    "h": 238.938,
    "s": 47.28,
    "l": 46.863
  },
  "oklch": {
    "l": 0.44426,
    "c": 0.17237,
    "h": 276
  },
  "luminance": 0.07972
}

Semantic roles & 50–950 ramp

primary

#3F41B0

secondary

#C3C288

accent

#D551D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3F41B0

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

Preview Lab → · Contrast checker → · Palette generator →