#3F40D6#3F40D6

#3F40D6 is a mid, highly saturated blue. Relative luminance 0.096; OKLCH L 47.7% C 0.222 H 273.8°. Best body text is #FFFFFF at 7.20:1 contrast (WCAG AA passes).

Color values

HEX	#3F40D6
RGB	rgb(63, 64, 214)
HSL	hsl(240, 65%, 54%)
HSV	hsv(240, 71%, 84%)
CMYK	cmyk(70.6%, 70.1%, 0%, 16.1%)
CIE-LAB	lab(37.07, 47.41, -76.56)
CIE-LCH	lch(37.07, 90.05, 301.77°)
OKLab	oklab(47.74% 0.0147 -0.2214)
OKLCH	oklch(47.74% 0.222 273.8)
XYZ	xyz(16.0168, 9.5770, 64.6097)
Luminance	0.0958 (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

#3F40D6 #D6D53F

analogous

#3F8BD6 #3F40D6 #8A3FD6

triadic

#3F40D6 #D63F40 #40D63F

tetradic

#3F40D6 #D63F8B #D6D53F #3FD68A

square

#3F40D6 #D63F8B #D6D53F #3FD68A

split-complementary

#3F40D6 #D68A3F #8BD63F

monochromatic

#1B1C7F #2627B2 #3F40D6 #7172E1 #A4A4EC

Accessibility & contrast

On white

7.20

#3F40D6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.92

#3F40D6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40D6

7.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40D6	#FFFFFF	#000000	##FFFFFF
##3F40D6	1.00	7.20	2.92	7.20
#FFFFFF	7.20	1.00	21.00	1.00
#000000	2.92	21.00	1.00	21.00
##FFFFFF	7.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005EDB

Deuteranopia (green-blind)

#0050D3

Tritanopia (blue-blind)

#006A86

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f40d6;
/* rgb */ color: rgb(63, 64, 214);
/* oklch */ color: oklch(47.7% 0.222 273.8);

Tailwind

colors: {
  custom: {
    50: '#8976e4',
    500: '#3f40d6',
    950: '#000000',
  },
}

SCSS

$custom: #3f40d6;
$custom-light: #8976e4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40d6",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 214
  },
  "hsl": {
    "h": 239.603,
    "s": 64.807,
    "l": 54.314
  },
  "oklch": {
    "l": 0.47742,
    "c": 0.22186,
    "h": 273.8
  },
  "luminance": 0.09579
}

Semantic roles & 50–950 ramp

primary

#3F40D6

secondary

#D8D898

accent

#E740E8

background

#F9F7FE

surface

#F2EDFC

border

#CCC8D5

text

#0D0816

muted

#7E7B84

Preview Lab

Preview with #3F40D6

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

Preview Lab → · Contrast checker → · Palette generator →