#3F43BB#3F43BB

#3F43BB is a mid, vivid blue. Relative luminance 0.087; OKLCH L 45.7% C 0.184 H 274.9°. Best body text is #FFFFFF at 7.69:1 contrast (WCAG AA passes).

Color values

HEX	#3F43BB
RGB	rgb(63, 67, 187)
HSL	hsl(238, 50%, 49%)
HSV	hsv(238, 66%, 73%)
CMYK	cmyk(66.3%, 64.2%, 0%, 26.7%)
CIE-LAB	lab(35.32, 36.58, -63.73)
CIE-LCH	lch(35.32, 73.48, 299.86°)
OKLab	oklab(45.73% 0.0157 -0.1838)
OKLCH	oklch(45.73% 0.184 274.9)
XYZ	xyz(13.0237, 8.6578, 47.9889)
Luminance	0.0866 (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

#3F43BB #BBB73F

analogous

#3F81BB #3F43BB #793FBB

triadic

#3F43BB #BB3F43 #43BB3F

tetradic

#3F43BB #BB3F81 #BBB73F #3FBB79

square

#3F43BB #BB3F81 #BBB73F #3FBB79

split-complementary

#3F43BB #BB793F #81BB3F

monochromatic

#20225F #30338D #3F43BB #6A6DCD #989ADC

Accessibility & contrast

On white

7.69

#3F43BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.73

#3F43BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F43BB

7.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F43BB	#FFFFFF	#000000	##FFFFFF
##3F43BB	1.00	7.69	2.73	7.69
#FFFFFF	7.69	1.00	21.00	1.00
#000000	2.73	21.00	1.00	21.00
##FFFFFF	7.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059BF

Deuteranopia (green-blind)

#004EB9

Tritanopia (blue-blind)

#006279

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f43bb;
/* rgb */ color: rgb(63, 67, 187);
/* oklch */ color: oklch(45.7% 0.184 274.9);

Tailwind

colors: {
  custom: {
    50: '#8377d0',
    500: '#3f43bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f43bb;
$custom-light: #8377d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f43bb",
  "rgb": {
    "r": 63,
    "g": 67,
    "b": 187
  },
  "hsl": {
    "h": 238.065,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.45732,
    "c": 0.18449,
    "h": 274.9
  },
  "luminance": 0.08659
}

Semantic roles & 50–950 ramp

primary

#3F43BB

secondary

#C8C68E

accent

#D54FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #3F43BB

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

Preview Lab → · Contrast checker → · Palette generator →