#3F51CC#3F51CC

#3F51CC is a mid, vivid blue. Relative luminance 0.113; OKLCH L 49.7% C 0.190 H 271.3°. Best body text is #FFFFFF at 6.44:1 contrast (WCAG AA passes).

Color values

HEX	#3F51CC
RGB	rgb(63, 81, 204)
HSL	hsl(232, 58%, 52%)
HSV	hsv(232, 69%, 80%)
CMYK	cmyk(69.1%, 60.3%, 0%, 20%)
CIE-LAB	lab(40.08, 33.70, -65.86)
CIE-LCH	lch(40.08, 73.98, 297.10°)
OKLab	oklab(49.67% 0.0043 -0.19)
OKLCH	oklch(49.67% 0.19 271.3)
XYZ	xyz(15.8877, 11.2997, 58.4588)
Luminance	0.1130 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51CC #CCBA3F

analogous

#3F98CC #3F51CC #733FCC

triadic

#3F51CC #CC3F51 #51CC3F

tetradic

#3F51CC #CC3F98 #CCBA3F #3FCC73

square

#3F51CC #CC3F98 #CCBA3F #3FCC73

split-complementary

#3F51CC #CC733F #98CC3F

monochromatic

#1E2972 #2B3AA3 #3F51CC #6F7DD9 #A0A9E6

Accessibility & contrast

On white

6.44

#3F51CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.26

#3F51CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51CC

6.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51CC	#FFFFFF	#000000	##FFFFFF
##3F51CC	1.00	6.44	3.26	6.44
#FFFFFF	6.44	1.00	21.00	1.00
#000000	3.26	21.00	1.00	21.00
##FFFFFF	6.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0065D0

Deuteranopia (green-blind)

#0058CA

Tritanopia (blue-blind)

#007087

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f51cc;
/* rgb */ color: rgb(63, 81, 204);
/* oklch */ color: oklch(49.7% 0.190 271.3);

Tailwind

colors: {
  custom: {
    50: '#8581dc',
    500: '#3f51cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f51cc;
$custom-light: #8581dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51cc",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 204
  },
  "hsl": {
    "h": 232.34,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.4967,
    "c": 0.19002,
    "h": 271.3
  },
  "luminance": 0.11301
}

Semantic roles & 50–950 ramp

primary

#3F51CC

secondary

#D2CA95

accent

#CE47E1

background

#F8F7FD

surface

#F0EEFB

border

#CBC9D4

text

#0C0A15

muted

#7D7C83

Preview Lab

Preview with #3F51CC

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

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