#3F40CD#3F40CD

#3F40CD is a mid, highly saturated blue. Relative luminance 0.091; OKLCH L 46.9% C 0.211 H 274.3°. Best body text is #FFFFFF at 7.43:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CD
RGB	rgb(63, 64, 205)
HSL	hsl(240, 59%, 53%)
HSV	hsv(240, 69%, 80%)
CMYK	cmyk(69.3%, 68.8%, 0%, 19.6%)
CIE-LAB	lab(36.23, 44.45, -72.74)
CIE-LCH	lch(36.23, 85.25, 301.43°)
OKLab	oklab(46.89% 0.0159 -0.2102)
OKLCH	oklch(46.89% 0.211 274.3)
XYZ	xyz(14.8991, 9.1299, 58.7228)
Luminance	0.0913 (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

#3F40CD #CDCC3F

analogous

#3F87CD #3F40CD #853FCD

triadic

#3F40CD #CD3F40 #40CD3F

tetradic

#3F40CD #CD3F87 #CDCC3F #3FCD85

square

#3F40CD #CD3F87 #CDCC3F #3FCD85

split-complementary

#3F40CD #CD853F #87CD3F

monochromatic

#1E1F74 #2B2CA4 #3F40CD #7070DA #A0A1E6

Accessibility & contrast

On white

7.43

#3F40CD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.83

#3F40CD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CD

7.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CD	#FFFFFF	#000000	##FFFFFF
##3F40CD	1.00	7.43	2.83	7.43
#FFFFFF	7.43	1.00	21.00	1.00
#000000	2.83	21.00	1.00	21.00
##FFFFFF	7.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CD1

Deuteranopia (green-blind)

#004FCA

Tritanopia (blue-blind)

#006681

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f40cd;
/* rgb */ color: rgb(63, 64, 205);
/* oklch */ color: oklch(46.9% 0.211 274.3);

Tailwind

colors: {
  custom: {
    50: '#8776dd',
    500: '#3f40cd',
    950: '#000000',
  },
}

SCSS

$custom: #3f40cd;
$custom-light: #8776dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40cd",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 205
  },
  "hsl": {
    "h": 239.577,
    "s": 58.678,
    "l": 52.549
  },
  "oklch": {
    "l": 0.46885,
    "c": 0.21081,
    "h": 274.3
  },
  "luminance": 0.09131
}

Semantic roles & 50–950 ramp

primary

#3F40CD

secondary

#D3D295

accent

#E146E2

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CD

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

Preview Lab → · Contrast checker → · Palette generator →