#3F50BC#3F50BC

#3F50BC is a mid, vivid blue. Relative luminance 0.104; OKLCH L 48.2% C 0.170 H 271.7°. Best body text is #FFFFFF at 6.81:1 contrast (WCAG AA passes).

Color values

HEX	#3F50BC
RGB	rgb(63, 80, 188)
HSL	hsl(232, 50%, 49%)
HSV	hsv(232, 66%, 74%)
CMYK	cmyk(66.5%, 57.4%, 0%, 26.3%)
CIE-LAB	lab(38.59, 28.70, -58.98)
CIE-LCH	lch(38.59, 65.59, 295.95°)
OKLab	oklab(48.18% 0.005 -0.1698)
OKLCH	oklch(48.18% 0.17 271.7)
XYZ	xyz(13.9926, 10.4236, 48.8418)
Luminance	0.1042 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F50BC #BCAB3F

analogous

#3F8FBC #3F50BC #6D3FBC

triadic

#3F50BC #BC3F50 #50BC3F

tetradic

#3F50BC #BC3F8F #BCAB3F #3FBC6D

square

#3F50BC #BC3F8F #BCAB3F #3FBC6D

split-complementary

#3F50BC #BC6D3F #8FBC3F

monochromatic

#202960 #303C8E #3F50BC #6B78CD #99A2DD

Accessibility & contrast

On white

6.81

#3F50BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.09

#3F50BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F50BC

6.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F50BC	#FFFFFF	#000000	##FFFFFF
##3F50BC	1.00	6.81	3.09	6.81
#FFFFFF	6.81	1.00	21.00	1.00
#000000	3.09	21.00	1.00	21.00
##FFFFFF	6.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061C0

Deuteranopia (green-blind)

#0055BA

Tritanopia (blue-blind)

#006A7E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f50bc;
/* rgb */ color: rgb(63, 80, 188);
/* oklch */ color: oklch(48.2% 0.170 271.7);

Tailwind

colors: {
  custom: {
    50: '#8280d1',
    500: '#3f50bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f50bc;
$custom-light: #8280d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f50bc",
  "rgb": {
    "r": 63,
    "g": 80,
    "b": 188
  },
  "hsl": {
    "h": 231.84,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.48176,
    "c": 0.16982,
    "h": 271.7
  },
  "luminance": 0.10425
}

Semantic roles & 50–950 ramp

primary

#3F50BC

secondary

#C9C18E

accent

#C64ED9

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F50BC

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

Preview Lab → · Contrast checker → · Palette generator →