#3F40D8#3F40D8

#3F40D8 is a mid, highly saturated blue. Relative luminance 0.097; OKLCH L 47.9% C 0.224 H 273.7°. Best body text is #FFFFFF at 7.15:1 contrast (WCAG AA passes).

Color values

HEX	#3F40D8
RGB	rgb(63, 64, 216)
HSL	hsl(240, 66%, 55%)
HSV	hsv(240, 71%, 85%)
CMYK	cmyk(70.8%, 70.4%, 0%, 15.3%)
CIE-LAB	lab(37.26, 48.07, -77.40)
CIE-LCH	lch(37.26, 91.11, 301.84°)
OKLab	oklab(47.94% 0.0144 -0.2238)
OKLCH	oklch(47.94% 0.224 273.7)
XYZ	xyz(16.2738, 9.6798, 65.9632)
Luminance	0.0968 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue (survey)

#0343DF

ΔE00 3.30

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40D8 #D8D73F

analogous

#3F8CD8 #3F40D8 #8B3FD8

triadic

#3F40D8 #D83F40 #40D83F

tetradic

#3F40D8 #D83F8C #D8D73F #3FD88B

square

#3F40D8 #D83F8C #D8D73F #3FD88B

split-complementary

#3F40D8 #D88B3F #8CD83F

monochromatic

#1A1B82 #2526B5 #3F40D8 #7273E2 #A5A5ED

Accessibility & contrast

On white

7.15

#3F40D8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.94

#3F40D8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40D8

7.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40D8	#FFFFFF	#000000	##FFFFFF
##3F40D8	1.00	7.15	2.94	7.15
#FFFFFF	7.15	1.00	21.00	1.00
#000000	2.94	21.00	1.00	21.00
##FFFFFF	7.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005FDD

Deuteranopia (green-blind)

#0050D5

Tritanopia (blue-blind)

#006A88

Achromatopsia (no color)

#585858

Design tokens & code

CSS

--color: #3f40d8;
/* rgb */ color: rgb(63, 64, 216);
/* oklch */ color: oklch(47.9% 0.224 273.7);

Tailwind

colors: {
  custom: {
    50: '#8976e5',
    500: '#3f40d8',
    950: '#000000',
  },
}

SCSS

$custom: #3f40d8;
$custom-light: #8976e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40d8",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 216
  },
  "hsl": {
    "h": 239.608,
    "s": 66.234,
    "l": 54.706
  },
  "oklch": {
    "l": 0.47935,
    "c": 0.22428,
    "h": 273.7
  },
  "luminance": 0.09681
}

Semantic roles & 50–950 ramp

primary

#3F40D8

secondary

#DAD999

accent

#E83FE9

background

#F9F7FE

surface

#F2EDFC

border

#CCC8D5

text

#0D0816

muted

#7E7B84

Preview Lab

Preview with #3F40D8

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

Preview Lab → · Contrast checker → · Palette generator →