#3F51C8#3F51C8

#3F51C8 is a mid, vivid blue. Relative luminance 0.111; OKLCH L 49.3% C 0.185 H 271.3°. Best body text is #FFFFFF at 6.52:1 contrast (WCAG AA passes).

Color values

HEX	#3F51C8
RGB	rgb(63, 81, 200)
HSL	hsl(232, 55%, 52%)
HSV	hsv(232, 69%, 78%)
CMYK	cmyk(68.5%, 59.5%, 0%, 21.6%)
CIE-LAB	lab(39.77, 32.30, -64.06)
CIE-LCH	lch(39.77, 71.74, 296.76°)
OKLab	oklab(49.34% 0.0043 -0.1847)
OKLCH	oklch(49.34% 0.185 271.3)
XYZ	xyz(15.4141, 11.1103, 55.9646)
Luminance	0.1111 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51C8 #C8B63F

analogous

#3F96C8 #3F51C8 #723FC8

triadic

#3F51C8 #C83F51 #51C83F

tetradic

#3F51C8 #C83F96 #C8B63F #3FC872

square

#3F51C8 #C83F96 #C8B63F #3FC872

split-complementary

#3F51C8 #C8723F #96C83F

monochromatic

#1F2A6D #2D3C9D #3F51C8 #6F7CD6 #9EA7E3

Accessibility & contrast

On white

6.52

#3F51C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.22

#3F51C8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51C8

6.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51C8	#FFFFFF	#000000	##FFFFFF
##3F51C8	1.00	6.52	3.22	6.52
#FFFFFF	6.52	1.00	21.00	1.00
#000000	3.22	21.00	1.00	21.00
##FFFFFF	6.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0064CC

Deuteranopia (green-blind)

#0058C6

Tritanopia (blue-blind)

#006F85

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f51c8;
/* rgb */ color: rgb(63, 81, 200);
/* oklch */ color: oklch(49.3% 0.185 271.3);

Tailwind

colors: {
  custom: {
    50: '#8581da',
    500: '#3f51c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f51c8;
$custom-light: #8581da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51c8",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 200
  },
  "hsl": {
    "h": 232.117,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.49338,
    "c": 0.18473,
    "h": 271.3
  },
  "luminance": 0.11112
}

Semantic roles & 50–950 ramp

primary

#3F51C8

secondary

#D0C893

accent

#CB49DF

background

#F8F7FD

surface

#F0EEFB

border

#CBC9D4

text

#0C0A15

muted

#7D7C83

Preview Lab

Preview with #3F51C8

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

Preview Lab → · Contrast checker → · Palette generator →