#3F47B5#3F47B5

#3F47B5 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.9% C 0.172 H 274.3°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#3F47B5
RGB	rgb(63, 71, 181)
HSL	hsl(236, 48%, 48%)
HSV	hsv(236, 65%, 71%)
CMYK	cmyk(65.2%, 60.8%, 0%, 29%)
CIE-LAB	lab(35.79, 32.00, -59.42)
CIE-LCH	lch(35.79, 67.49, 298.30°)
OKLab	oklab(45.93% 0.0127 -0.1711)
OKLCH	oklch(45.93% 0.172 274.3)
XYZ	xyz(12.6409, 8.8983, 44.7585)
Luminance	0.0890 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F47B5 #B5AD3F

analogous

#3F82B5 #3F47B5 #723FB5

triadic

#3F47B5 #B53F47 #47B53F

tetradic

#3F47B5 #B53F82 #B5AD3F #3FB572

square

#3F47B5 #B53F82 #B5AD3F #3FB572

split-complementary

#3F47B5 #B5723F #82B53F

monochromatic

#1F235A #2F3588 #3F47B5 #676ECA #9499DA

Accessibility & contrast

On white

7.55

#3F47B5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3F47B5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F47B5

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F47B5	#FFFFFF	#000000	##FFFFFF
##3F47B5	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AB9

Deuteranopia (green-blind)

#004FB3

Tritanopia (blue-blind)

#006277

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f47b5;
/* rgb */ color: rgb(63, 71, 181);
/* oklch */ color: oklch(45.9% 0.172 274.3);

Tailwind

colors: {
  custom: {
    50: '#827acc',
    500: '#3f47b5',
    950: '#000000',
  },
}

SCSS

$custom: #3f47b5;
$custom-light: #827acc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f47b5",
  "rgb": {
    "r": 63,
    "g": 71,
    "b": 181
  },
  "hsl": {
    "h": 235.932,
    "s": 48.361,
    "l": 47.843
  },
  "oklch": {
    "l": 0.45925,
    "c": 0.17162,
    "h": 274.3
  },
  "luminance": 0.08899
}

Semantic roles & 50–950 ramp

primary

#3F47B5

secondary

#C5C18A

accent

#CF50D8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0913

muted

#7D7B82

Preview Lab

Preview with #3F47B5

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

Preview Lab → · Contrast checker → · Palette generator →