#3F51BD#3F51BD

#3F51BD is a mid, vivid blue. Relative luminance 0.106; OKLCH L 48.4% C 0.170 H 271.4°. Best body text is #FFFFFF at 6.72:1 contrast (WCAG AA passes).

Color values

HEX	#3F51BD
RGB	rgb(63, 81, 189)
HSL	hsl(231, 50%, 49%)
HSV	hsv(231, 67%, 74%)
CMYK	cmyk(66.7%, 57.1%, 0%, 25.9%)
CIE-LAB	lab(38.92, 28.41, -59.02)
CIE-LCH	lch(38.92, 65.51, 295.71°)
OKLab	oklab(48.45% 0.0042 -0.1699)
OKLCH	oklch(48.45% 0.17 271.4)
XYZ	xyz(14.1745, 10.6144, 49.4360)
Luminance	0.1062 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F51BD #BDAB3F

analogous

#3F90BD #3F51BD #6C3FBD

triadic

#3F51BD #BD3F51 #51BD3F

tetradic

#3F51BD #BD3F90 #BDAB3F #3FBD6C

square

#3F51BD #BD3F90 #BDAB3F #3FBD6C

split-complementary

#3F51BD #BD6C3F #90BD3F

monochromatic

#202A61 #303D8F #3F51BD #6B79CE #99A3DD

Accessibility & contrast

On white

6.72

#3F51BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.12

#3F51BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F51BD

6.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F51BD	#FFFFFF	#000000	##FFFFFF
##3F51BD	1.00	6.72	3.12	6.72
#FFFFFF	6.72	1.00	21.00	1.00
#000000	3.12	21.00	1.00	21.00
##FFFFFF	6.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0062C1

Deuteranopia (green-blind)

#0056BB

Tritanopia (blue-blind)

#006B7F

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #3f51bd;
/* rgb */ color: rgb(63, 81, 189);
/* oklch */ color: oklch(48.4% 0.170 271.4);

Tailwind

colors: {
  custom: {
    50: '#8281d2',
    500: '#3f51bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f51bd;
$custom-light: #8281d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f51bd",
  "rgb": {
    "r": 63,
    "g": 81,
    "b": 189
  },
  "hsl": {
    "h": 231.429,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.48447,
    "c": 0.16993,
    "h": 271.4
  },
  "luminance": 0.10616
}

Semantic roles & 50–950 ramp

primary

#3F51BD

secondary

#C9C18F

accent

#C64EDA

background

#F8F7FD

surface

#F0EEFA

border

#CBC9D3

text

#0C0A14

muted

#7D7C83

Preview Lab

Preview with #3F51BD

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

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