#3F40CB#3F40CB

#3F40CB is a mid, highly saturated blue. Relative luminance 0.090; OKLCH L 46.7% C 0.208 H 274.5°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CB
RGB	rgb(63, 64, 203)
HSL	hsl(240, 57%, 52%)
HSV	hsv(240, 69%, 80%)
CMYK	cmyk(69%, 68.5%, 0%, 20.4%)
CIE-LAB	lab(36.05, 43.79, -71.88)
CIE-LCH	lch(36.05, 84.17, 301.35°)
OKLab	oklab(46.7% 0.0162 -0.2077)
OKLCH	oklch(46.7% 0.208 274.5)
XYZ	xyz(14.6592, 9.0340, 57.4595)
Luminance	0.0903 (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

#3F40CB #CBCA3F

analogous

#3F86CB #3F40CB #843FCB

triadic

#3F40CB #CB3F40 #40CB3F

tetradic

#3F40CB #CB3F86 #CBCA3F #3FCB84

square

#3F40CB #CB3F86 #CBCA3F #3FCB84

split-complementary

#3F40CB #CB843F #86CB3F

monochromatic

#1F1F71 #2C2CA1 #3F40CB #6F70D8 #9FA0E5

Accessibility & contrast

On white

7.48

#3F40CB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#3F40CB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CB

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CB	#FFFFFF	#000000	##FFFFFF
##3F40CB	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BCF

Deuteranopia (green-blind)

#004EC8

Tritanopia (blue-blind)

#006680

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f40cb;
/* rgb */ color: rgb(63, 64, 203);
/* oklch */ color: oklch(46.7% 0.208 274.5);

Tailwind

colors: {
  custom: {
    50: '#8776dc',
    500: '#3f40cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f40cb;
$custom-light: #8776dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40cb",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 203
  },
  "hsl": {
    "h": 239.571,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.46696,
    "c": 0.20833,
    "h": 274.5
  },
  "luminance": 0.09035
}

Semantic roles & 50–950 ramp

primary

#3F40CB

secondary

#D1D194

accent

#E047E1

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CB

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

Preview Lab → · Contrast checker → · Palette generator →