#3F51D2#3F51D2

#3F51D2 is a mid, vivid blue. Relative luminance 0.116; OKLCH L 50.2% C 0.198 H 271.2°. Best body text is #FFFFFF at 6.33:1 contrast (WCAG AA passes).

Color values

HEX	#3F51D2
RGB	rgb(63, 81, 210)
HSL	hsl(233, 62%, 54%)
HSV	hsv(233, 70%, 82%)
CMYK	cmyk(70%, 61.4%, 0%, 17.6%)
CIE-LAB	lab(40.56, 35.80, -68.54)
CIE-LCH	lch(40.56, 77.32, 297.58°)
OKLab	oklab(50.18% 0.0041 -0.1978)
OKLCH	oklch(50.18% 0.198 271.2)
XYZ	xyz(16.6212, 11.5931, 62.3220)
Luminance	0.1159 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51D2 #D2C03F

analogous

#3F9AD2 #3F51D2 #763FD2

triadic

#3F51D2 #D23F51 #51D23F

tetradic

#3F51D2 #D23F9A #D2C03F #3FD276

square

#3F51D2 #D23F9A #D2C03F #3FD276

split-complementary

#3F51D2 #D2763F #9AD23F

monochromatic

#1D287A #2838AC #3F51D2 #717EDE #A2ABE9

Accessibility & contrast

On white

6.33

#3F51D2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.32

#3F51D2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51D2

6.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51D2	#FFFFFF	#000000	##FFFFFF
##3F51D2	1.00	6.33	3.32	6.33
#FFFFFF	6.33	1.00	21.00	1.00
#000000	3.32	21.00	1.00	21.00
##FFFFFF	6.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0067D6

Deuteranopia (green-blind)

#0059D0

Tritanopia (blue-blind)

#00728A

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #3f51d2;
/* rgb */ color: rgb(63, 81, 210);
/* oklch */ color: oklch(50.2% 0.198 271.2);

Tailwind

colors: {
  custom: {
    50: '#8781e1',
    500: '#3f51d2',
    950: '#000000',
  },
}

SCSS

$custom: #3f51d2;
$custom-light: #8781e1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51d2",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 210
  },
  "hsl": {
    "h": 232.653,
    "s": 62.025,
    "l": 53.529
  },
  "oklch": {
    "l": 0.50175,
    "c": 0.19786,
    "h": 271.2
  },
  "luminance": 0.11595
}

Semantic roles & 50–950 ramp

primary

#3F51D2

secondary

#D6CE97

accent

#D143E5

background

#F9F7FD

surface

#F1EEFB

border

#CBC9D4

text

#0D0A15

muted

#7E7C83

Preview Lab

Preview with #3F51D2

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

Preview Lab → · Contrast checker → · Palette generator →