#3F51CE#3F51CE

#3F51CE is a mid, vivid blue. Relative luminance 0.114; OKLCH L 49.8% C 0.193 H 271.3°. Best body text is #FFFFFF at 6.40:1 contrast (WCAG AA passes).

Color values

HEX	#3F51CE
RGB	rgb(63, 81, 206)
HSL	hsl(232, 59%, 53%)
HSV	hsv(232, 69%, 81%)
CMYK	cmyk(69.4%, 60.7%, 0%, 19.2%)
CIE-LAB	lab(40.24, 34.40, -66.76)
CIE-LCH	lch(40.24, 75.10, 297.26°)
OKLab	oklab(49.84% 0.0042 -0.1926)
OKLCH	oklch(49.84% 0.193 271.3)
XYZ	xyz(16.1291, 11.3963, 59.7302)
Luminance	0.1140 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51CE #CEBC3F

analogous

#3F98CE #3F51CE #753FCE

triadic

#3F51CE #CE3F51 #51CE3F

tetradic

#3F51CE #CE3F98 #CEBC3F #3FCE75

square

#3F51CE #CE3F98 #CEBC3F #3FCE75

split-complementary

#3F51CE #CE753F #98CE3F

monochromatic

#1E2975 #2A3AA6 #3F51CE #707DDA #A1A9E7

Accessibility & contrast

On white

6.40

#3F51CE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.28

#3F51CE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51CE

6.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51CE	#FFFFFF	#000000	##FFFFFF
##3F51CE	1.00	6.40	3.28	6.40
#FFFFFF	6.40	1.00	21.00	1.00
#000000	3.28	21.00	1.00	21.00
##FFFFFF	6.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0066D2

Deuteranopia (green-blind)

#0058CC

Tritanopia (blue-blind)

#007188

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #3f51ce;
/* rgb */ color: rgb(63, 81, 206);
/* oklch */ color: oklch(49.8% 0.193 271.3);

Tailwind

colors: {
  custom: {
    50: '#8681de',
    500: '#3f51ce',
    950: '#000000',
  },
}

SCSS

$custom: #3f51ce;
$custom-light: #8681de;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51ce",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 206
  },
  "hsl": {
    "h": 232.448,
    "s": 59.336,
    "l": 52.745
  },
  "oklch": {
    "l": 0.49837,
    "c": 0.19265,
    "h": 271.3
  },
  "luminance": 0.11398
}

Semantic roles & 50–950 ramp

primary

#3F51CE

secondary

#D3CC95

accent

#CF45E3

background

#F8F7FD

surface

#F0EEFB

border

#CBC9D4

text

#0D0A15

muted

#7D7C83

Preview Lab

Preview with #3F51CE

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

Preview Lab → · Contrast checker → · Palette generator →