#3F50BB#3F50BB

#3F50BB is a mid, vivid blue. Relative luminance 0.104; OKLCH L 48.1% C 0.168 H 271.7°. Best body text is #FFFFFF at 6.83:1 contrast (WCAG AA passes).

Color values

HEX	#3F50BB
RGB	rgb(63, 80, 187)
HSL	hsl(232, 50%, 49%)
HSV	hsv(232, 66%, 73%)
CMYK	cmyk(66.3%, 57.2%, 0%, 26.7%)
CIE-LAB	lab(38.52, 28.35, -58.51)
CIE-LCH	lch(38.52, 65.02, 295.85°)
OKLab	oklab(48.1% 0.005 -0.1684)
OKLCH	oklch(48.1% 0.168 271.7)
XYZ	xyz(13.8852, 10.3807, 48.2760)
Luminance	0.1038 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F50BB #BBAA3F

analogous

#3F8EBB #3F50BB #6C3FBB

triadic

#3F50BB #BB3F50 #50BB3F

tetradic

#3F50BB #BB3F8E #BBAA3F #3FBB6C

square

#3F50BB #BB3F8E #BBAA3F #3FBB6C

split-complementary

#3F50BB #BB6C3F #8EBB3F

monochromatic

#20295F #303C8D #3F50BB #6A78CD #98A1DC

Accessibility & contrast

On white

6.83

#3F50BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#3F50BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F50BB

6.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F50BB	#FFFFFF	#000000	##FFFFFF
##3F50BB	1.00	6.83	3.08	6.83
#FFFFFF	6.83	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060BF

Deuteranopia (green-blind)

#0055B9

Tritanopia (blue-blind)

#006A7D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f50bb;
/* rgb */ color: rgb(63, 80, 187);
/* oklch */ color: oklch(48.1% 0.168 271.7);

Tailwind

colors: {
  custom: {
    50: '#8280d0',
    500: '#3f50bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f50bb;
$custom-light: #8280d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f50bb",
  "rgb": {
    "r": 63,
    "g": 80,
    "b": 187
  },
  "hsl": {
    "h": 231.774,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.48096,
    "c": 0.16846,
    "h": 271.7
  },
  "luminance": 0.10382
}

Semantic roles & 50–950 ramp

primary

#3F50BB

secondary

#C8C08E

accent

#C64FD9

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F50BB

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

Preview Lab → · Contrast checker → · Palette generator →