#3F40CE#3F40CE

#3F40CE is a mid, highly saturated blue. Relative luminance 0.092; OKLCH L 47.0% C 0.212 H 274.3°. Best body text is #FFFFFF at 7.40:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CE
RGB	rgb(63, 64, 206)
HSL	hsl(240, 59%, 53%)
HSV	hsv(240, 69%, 81%)
CMYK	cmyk(69.4%, 68.9%, 0%, 19.2%)
CIE-LAB	lab(36.33, 44.78, -73.17)
CIE-LCH	lch(36.33, 85.78, 301.47°)
OKLab	oklab(46.98% 0.0158 -0.2115)
OKLCH	oklch(46.98% 0.212 274.3)
XYZ	xyz(15.0202, 9.1784, 59.3606)
Luminance	0.0918 (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

#3F40CE #CECD3F

analogous

#3F88CE #3F40CE #853FCE

triadic

#3F40CE #CE3F40 #40CE3F

tetradic

#3F40CE #CE3F88 #CECD3F #3FCE85

square

#3F40CE #CE3F88 #CECD3F #3FCE85

split-complementary

#3F40CE #CE853F #88CE3F

monochromatic

#1E1E75 #2A2BA6 #3F40CE #7071DA #A1A1E7

Accessibility & contrast

On white

7.40

#3F40CE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.84

#3F40CE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CE

7.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CE	#FFFFFF	#000000	##FFFFFF
##3F40CE	1.00	7.40	2.84	7.40
#FFFFFF	7.40	1.00	21.00	1.00
#000000	2.84	21.00	1.00	21.00
##FFFFFF	7.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CD2

Deuteranopia (green-blind)

#004FCB

Tritanopia (blue-blind)

#006782

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f40ce;
/* rgb */ color: rgb(63, 64, 206);
/* oklch */ color: oklch(47.0% 0.212 274.3);

Tailwind

colors: {
  custom: {
    50: '#8776de',
    500: '#3f40ce',
    950: '#000000',
  },
}

SCSS

$custom: #3f40ce;
$custom-light: #8776de;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40ce",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 206
  },
  "hsl": {
    "h": 239.58,
    "s": 59.336,
    "l": 52.745
  },
  "oklch": {
    "l": 0.46979,
    "c": 0.21206,
    "h": 274.3
  },
  "luminance": 0.0918
}

Semantic roles & 50–950 ramp

primary

#3F40CE

secondary

#D3D395

accent

#E145E3

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CE

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

Preview Lab → · Contrast checker → · Palette generator →