#3F40CA#3F40CA

#3F40CA is a mid, highly saturated blue. Relative luminance 0.090; OKLCH L 46.6% C 0.207 H 274.5°. Best body text is #FFFFFF at 7.51:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CA
RGB	rgb(63, 64, 202)
HSL	hsl(240, 57%, 52%)
HSV	hsv(240, 69%, 79%)
CMYK	cmyk(68.8%, 68.3%, 0%, 20.8%)
CIE-LAB	lab(35.96, 43.45, -71.45)
CIE-LCH	lch(35.96, 83.63, 301.31°)
OKLab	oklab(46.6% 0.0163 -0.2064)
OKLCH	oklch(46.6% 0.207 274.5)
XYZ	xyz(14.5404, 8.9865, 56.8339)
Luminance	0.0899 (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

#3F40CA #CAC93F

analogous

#3F86CA #3F40CA #833FCA

triadic

#3F40CA #CA3F40 #40CA3F

tetradic

#3F40CA #CA3F86 #CAC93F #3FCA83

square

#3F40CA #CA3F86 #CAC93F #3FCA83

split-complementary

#3F40CA #CA833F #86CA3F

monochromatic

#1F1F70 #2C2DA0 #3F40CA #6F70D7 #9F9FE4

Accessibility & contrast

On white

7.51

#3F40CA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#3F40CA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CA

7.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CA	#FFFFFF	#000000	##FFFFFF
##3F40CA	1.00	7.51	2.80	7.51
#FFFFFF	7.51	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BCE

Deuteranopia (green-blind)

#004EC7

Tritanopia (blue-blind)

#006580

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f40ca;
/* rgb */ color: rgb(63, 64, 202);
/* oklch */ color: oklch(46.6% 0.207 274.5);

Tailwind

colors: {
  custom: {
    50: '#8676db',
    500: '#3f40ca',
    950: '#000000',
  },
}

SCSS

$custom: #3f40ca;
$custom-light: #8676db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40ca",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 202
  },
  "hsl": {
    "h": 239.568,
    "s": 56.735,
    "l": 51.961
  },
  "oklch": {
    "l": 0.46603,
    "c": 0.20708,
    "h": 274.5
  },
  "luminance": 0.08988
}

Semantic roles & 50–950 ramp

primary

#3F40CA

secondary

#D1D094

accent

#DF48E0

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CA

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

Preview Lab → · Contrast checker → · Palette generator →