#3F50B7#3F50B7

#3F50B7 is a mid, vivid blue. Relative luminance 0.102; OKLCH L 47.8% C 0.163 H 271.7°. Best body text is #FFFFFF at 6.90:1 contrast (WCAG AA passes).

Color values

HEX	#3F50B7
RGB	rgb(63, 80, 183)
HSL	hsl(232, 49%, 48%)
HSV	hsv(232, 66%, 72%)
CMYK	cmyk(65.6%, 56.3%, 0%, 28.2%)
CIE-LAB	lab(38.22, 26.93, -56.64)
CIE-LCH	lch(38.22, 62.72, 295.43°)
OKLab	oklab(47.78% 0.0049 -0.1629)
OKLCH	oklch(47.78% 0.163 271.7)
XYZ	xyz(13.4629, 10.2118, 46.0522)
Luminance	0.1021 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F50B7 #B7A63F

analogous

#3F8CB7 #3F50B7 #6A3FB7

triadic

#3F50B7 #B73F50 #50B73F

tetradic

#3F50B7 #B73F8C #B7A63F #3FB76A

square

#3F50B7 #B73F8C #B7A63F #3FB76A

split-complementary

#3F50B7 #B76A3F #8CB73F

monochromatic

#20285C #2F3C89 #3F50B7 #6876CB #969FDB

Accessibility & contrast

On white

6.90

#3F50B7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.04

#3F50B7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F50B7

6.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F50B7	#FFFFFF	#000000	##FFFFFF
##3F50B7	1.00	6.90	3.04	6.90
#FFFFFF	6.90	1.00	21.00	1.00
#000000	3.04	21.00	1.00	21.00
##FFFFFF	6.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060BB

Deuteranopia (green-blind)

#0055B5

Tritanopia (blue-blind)

#00697B

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3f50b7;
/* rgb */ color: rgb(63, 80, 183);
/* oklch */ color: oklch(47.8% 0.163 271.7);

Tailwind

colors: {
  custom: {
    50: '#8180cd',
    500: '#3f50b7',
    950: '#000000',
  },
}

SCSS

$custom: #3f50b7;
$custom-light: #8180cd;
$custom-dark: #000000;

JSON

{
  "hex": "#3f50b7",
  "rgb": {
    "r": 63,
    "g": 80,
    "b": 183
  },
  "hsl": {
    "h": 231.5,
    "s": 48.78,
    "l": 48.235
  },
  "oklch": {
    "l": 0.47781,
    "c": 0.16297,
    "h": 271.7
  },
  "luminance": 0.10213
}

Semantic roles & 50–950 ramp

primary

#3F50B7

secondary

#C6BE8B

accent

#C54FD8

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #3F50B7

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

Preview Lab → · Contrast checker → · Palette generator →