#3F51CF#3F51CF

#3F51CF is a mid, vivid blue. Relative luminance 0.114; OKLCH L 49.9% C 0.194 H 271.2°. Best body text is #FFFFFF at 6.38:1 contrast (WCAG AA passes).

Color values

HEX	#3F51CF
RGB	rgb(63, 81, 207)
HSL	hsl(233, 60%, 53%)
HSV	hsv(233, 70%, 81%)
CMYK	cmyk(69.6%, 60.9%, 0%, 18.8%)
CIE-LAB	lab(40.32, 34.75, -67.20)
CIE-LCH	lch(40.32, 75.66, 297.35°)
OKLab	oklab(49.92% 0.0042 -0.1939)
OKLCH	oklch(49.92% 0.194 271.2)
XYZ	xyz(16.2510, 11.4450, 60.3721)
Luminance	0.1145 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51CF #CFBD3F

analogous

#3F99CF #3F51CF #753FCF

triadic

#3F51CF #CF3F51 #51CF3F

tetradic

#3F51CF #CF3F99 #CFBD3F #3FCF75

square

#3F51CF #CF3F99 #CFBD3F #3FCF75

split-complementary

#3F51CF #CF753F #99CF3F

monochromatic

#1E2976 #2A39A7 #3F51CF #707DDB #A1AAE7

Accessibility & contrast

On white

6.38

#3F51CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.29

#3F51CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51CF

6.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51CF	#FFFFFF	#000000	##FFFFFF
##3F51CF	1.00	6.38	3.29	6.38
#FFFFFF	6.38	1.00	21.00	1.00
#000000	3.29	21.00	1.00	21.00
##FFFFFF	6.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0066D3

Deuteranopia (green-blind)

#0059CD

Tritanopia (blue-blind)

#007188

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #3f51cf;
/* rgb */ color: rgb(63, 81, 207);
/* oklch */ color: oklch(49.9% 0.194 271.2);

Tailwind

colors: {
  custom: {
    50: '#8681df',
    500: '#3f51cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f51cf;
$custom-light: #8681df;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51cf",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 207
  },
  "hsl": {
    "h": 232.5,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.49922,
    "c": 0.19396,
    "h": 271.2
  },
  "luminance": 0.11447
}

Semantic roles & 50–950 ramp

primary

#3F51CF

secondary

#D4CC96

accent

#CF45E3

background

#F8F7FD

surface

#F0EEFB

border

#CBC9D4

text

#0D0A15

muted

#7D7C83

Preview Lab

Preview with #3F51CF

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

Preview Lab → · Contrast checker → · Palette generator →