#3F51D9#3F51D9

#3F51D9 is a mid, highly saturated blue. Relative luminance 0.120; OKLCH L 50.8% C 0.207 H 271.1°. Best body text is #FFFFFF at 6.19:1 contrast (WCAG AA passes).

Color values

HEX	#3F51D9
RGB	rgb(63, 81, 217)
HSL	hsl(233, 67%, 55%)
HSV	hsv(233, 71%, 85%)
CMYK	cmyk(71%, 62.7%, 0%, 14.9%)
CIE-LAB	lab(41.14, 38.24, -71.62)
CIE-LCH	lch(41.14, 81.19, 298.10°)
OKLab	oklab(50.78% 0.0039 -0.2068)
OKLCH	oklch(50.78% 0.207 271.1)
XYZ	xyz(17.5125, 11.9496, 67.0158)
Luminance	0.1195 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51D9 #D9C73F

analogous

#3F9ED9 #3F51D9 #7A3FD9

triadic

#3F51D9 #D93F51 #51D93F

tetradic

#3F51D9 #D93F9E #D9C73F #3FD97A

square

#3F51D9 #D93F9E #D9C73F #3FD97A

split-complementary

#3F51D9 #D97A3F #9ED93F

monochromatic

#1A2684 #2435B7 #3F51D9 #727FE3 #A5AEED

Accessibility & contrast

On white

6.19

#3F51D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.39

#3F51D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51D9

6.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51D9	#FFFFFF	#000000	##FFFFFF
##3F51D9	1.00	6.19	3.39	6.19
#FFFFFF	6.19	1.00	21.00	1.00
#000000	3.39	21.00	1.00	21.00
##FFFFFF	6.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068DD

Deuteranopia (green-blind)

#005AD6

Tritanopia (blue-blind)

#00748D

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3f51d9;
/* rgb */ color: rgb(63, 81, 217);
/* oklch */ color: oklch(50.8% 0.207 271.1);

Tailwind

colors: {
  custom: {
    50: '#8882e6',
    500: '#3f51d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f51d9;
$custom-light: #8882e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51d9",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 217
  },
  "hsl": {
    "h": 232.987,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.50776,
    "c": 0.20689,
    "h": 271.1
  },
  "luminance": 0.11951
}

Semantic roles & 50–950 ramp

primary

#3F51D9

secondary

#DAD39A

accent

#D63EEA

background

#F9F7FE

surface

#F1EEFC

border

#CBC9D5

text

#0D0A16

muted

#7E7C84

Preview Lab

Preview with #3F51D9

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

Preview Lab → · Contrast checker → · Palette generator →