#3F40D5#3F40D5

#3F40D5 is a mid, highly saturated blue. Relative luminance 0.095; OKLCH L 47.6% C 0.221 H 273.9°. Best body text is #FFFFFF at 7.23:1 contrast (WCAG AA passes).

Color values

HEX	#3F40D5
RGB	rgb(63, 64, 213)
HSL	hsl(240, 64%, 54%)
HSV	hsv(240, 70%, 84%)
CMYK	cmyk(70.4%, 70%, 0%, 16.5%)
CIE-LAB	lab(36.98, 47.09, -76.14)
CIE-LCH	lch(36.98, 89.52, 301.73°)
OKLab	oklab(47.65% 0.0149 -0.2201)
OKLCH	oklch(47.65% 0.221 273.9)
XYZ	xyz(15.8895, 9.5261, 63.9392)
Luminance	0.0953 (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

#3F40D5 #D5D43F

analogous

#3F8BD5 #3F40D5 #893FD5

triadic

#3F40D5 #D53F40 #40D53F

tetradic

#3F40D5 #D53F8B #D5D43F #3FD589

square

#3F40D5 #D53F8B #D5D43F #3FD589

split-complementary

#3F40D5 #D5893F #8BD53F

monochromatic

#1C1C7E #2727B0 #3F40D5 #7172E0 #A3A4EB

Accessibility & contrast

On white

7.23

#3F40D5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.91

#3F40D5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40D5

7.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40D5	#FFFFFF	#000000	##FFFFFF
##3F40D5	1.00	7.23	2.91	7.23
#FFFFFF	7.23	1.00	21.00	1.00
#000000	2.91	21.00	1.00	21.00
##FFFFFF	7.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ED9

Deuteranopia (green-blind)

#0050D2

Tritanopia (blue-blind)

#006986

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f40d5;
/* rgb */ color: rgb(63, 64, 213);
/* oklch */ color: oklch(47.6% 0.221 273.9);

Tailwind

colors: {
  custom: {
    50: '#8976e3',
    500: '#3f40d5',
    950: '#000000',
  },
}

SCSS

$custom: #3f40d5;
$custom-light: #8976e3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40d5",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 213
  },
  "hsl": {
    "h": 239.6,
    "s": 64.103,
    "l": 54.118
  },
  "oklch": {
    "l": 0.47646,
    "c": 0.22065,
    "h": 273.9
  },
  "luminance": 0.09528
}

Semantic roles & 50–950 ramp

primary

#3F40D5

secondary

#D8D798

accent

#E641E7

background

#F9F7FE

surface

#F1EDFC

border

#CBC8D5

text

#0D0816

muted

#7E7B84

Preview Lab

Preview with #3F40D5

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

Preview Lab → · Contrast checker → · Palette generator →