#3F50B3#3F50B3

#3F50B3 is a mid, vivid blue. Relative luminance 0.100; OKLCH L 47.5% C 0.157 H 271.7°. Best body text is #FFFFFF at 6.98:1 contrast (WCAG AA passes).

Color values

HEX	#3F50B3
RGB	rgb(63, 80, 179)
HSL	hsl(231, 48%, 47%)
HSV	hsv(231, 65%, 70%)
CMYK	cmyk(64.8%, 55.3%, 0%, 29.8%)
CIE-LAB	lab(37.93, 25.51, -54.76)
CIE-LCH	lch(37.93, 60.41, 294.98°)
OKLab	oklab(47.47% 0.0047 -0.1574)
OKLCH	oklch(47.47% 0.157 271.7)
XYZ	xyz(13.0525, 10.0476, 43.8906)
Luminance	0.1005 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F50B3 #B3A23F

analogous

#3F8AB3 #3F50B3 #683FB3

triadic

#3F50B3 #B33F50 #50B33F

tetradic

#3F50B3 #B33F8A #B3A23F #3FB368

square

#3F50B3 #B33F8A #B3A23F #3FB368

split-complementary

#3F50B3 #B3683F #8AB33F

monochromatic

#1F2858 #2F3C86 #3F50B3 #6675C9 #939ED9

Accessibility & contrast

On white

6.98

#3F50B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.01

#3F50B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F50B3

6.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F50B3	#FFFFFF	#000000	##FFFFFF
##3F50B3	1.00	6.98	3.01	6.98
#FFFFFF	6.98	1.00	21.00	1.00
#000000	3.01	21.00	1.00	21.00
##FFFFFF	6.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005FB6

Deuteranopia (green-blind)

#0054B1

Tritanopia (blue-blind)

#006879

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #3f50b3;
/* rgb */ color: rgb(63, 80, 179);
/* oklch */ color: oklch(47.5% 0.157 271.7);

Tailwind

colors: {
  custom: {
    50: '#8180ca',
    500: '#3f50b3',
    950: '#000000',
  },
}

SCSS

$custom: #3f50b3;
$custom-light: #8180ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f50b3",
  "rgb": {
    "r": 63,
    "g": 80,
    "b": 179
  },
  "hsl": {
    "h": 231.207,
    "s": 47.934,
    "l": 47.451
  },
  "oklch": {
    "l": 0.47469,
    "c": 0.15743,
    "h": 271.7
  },
  "luminance": 0.10049
}

Semantic roles & 50–950 ramp

primary

#3F50B3

secondary

#C4BC89

accent

#C450D8

background

#F8F7FC

surface

#EFEEF8

border

#CAC9D1

text

#0B0A13

muted

#7C7C82

Preview Lab

Preview with #3F50B3

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

Preview Lab → · Contrast checker → · Palette generator →