#3F40C5#3F40C5

#3F40C5 is a mid, highly saturated blue. Relative luminance 0.088; OKLCH L 46.1% C 0.201 H 274.8°. Best body text is #FFFFFF at 7.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F40C5
RGB	rgb(63, 64, 197)
HSL	hsl(240, 54%, 51%)
HSV	hsv(240, 68%, 77%)
CMYK	cmyk(68%, 67.5%, 0%, 22.7%)
CIE-LAB	lab(35.51, 41.79, -69.28)
CIE-LCH	lch(35.51, 80.91, 301.10°)
OKLab	oklab(46.14% 0.0169 -0.2001)
OKLCH	oklch(46.14% 0.201 274.8)
XYZ	xyz(13.9580, 8.7535, 53.7665)
Luminance	0.0876 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue Blue

#2242C7

ΔE00 2.82

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40C5 #C5C43F

analogous

#3F83C5 #3F40C5 #813FC5

triadic

#3F40C5 #C53F40 #40C53F

tetradic

#3F40C5 #C53F83 #C5C43F #3FC581

square

#3F40C5 #C53F83 #C5C43F #3FC581

split-complementary

#3F40C5 #C5813F #83C53F

monochromatic

#20206A #2E2F99 #3F40C5 #6E6FD3 #9D9EE1

Accessibility & contrast

On white

7.63

#3F40C5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.75

#3F40C5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40C5

7.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40C5	#FFFFFF	#000000	##FFFFFF
##3F40C5	1.00	7.63	2.75	7.63
#FFFFFF	7.63	1.00	21.00	1.00
#000000	2.75	21.00	1.00	21.00
##FFFFFF	7.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AC9

Deuteranopia (green-blind)

#004DC2

Tritanopia (blue-blind)

#00647D

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f40c5;
/* rgb */ color: rgb(63, 64, 197);
/* oklch */ color: oklch(46.1% 0.201 274.8);

Tailwind

colors: {
  custom: {
    50: '#8575d8',
    500: '#3f40c5',
    950: '#000000',
  },
}

SCSS

$custom: #3f40c5;
$custom-light: #8575d8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40c5",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 197
  },
  "hsl": {
    "h": 239.552,
    "s": 53.6,
    "l": 50.98
  },
  "oklch": {
    "l": 0.46137,
    "c": 0.20081,
    "h": 274.8
  },
  "luminance": 0.08755
}

Semantic roles & 50–950 ramp

primary

#3F40C5

secondary

#CECD92

accent

#DC4BDD

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0D0815

muted

#7D7B83

Preview Lab

Preview with #3F40C5

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

Preview Lab → · Contrast checker → · Palette generator →