#3F40C2#3F40C2

#3F40C2 is a mid, vivid blue. Relative luminance 0.086; OKLCH L 45.9% C 0.197 H 275.0°. Best body text is #FFFFFF at 7.71:1 contrast (WCAG AA passes).

Color values

HEX	#3F40C2
RGB	rgb(63, 64, 194)
HSL	hsl(240, 52%, 50%)
HSV	hsv(240, 68%, 76%)
CMYK	cmyk(67.5%, 67%, 0%, 23.9%)
CIE-LAB	lab(35.24, 40.78, -67.97)
CIE-LCH	lch(35.24, 79.26, 300.97°)
OKLab	oklab(45.86% 0.0173 -0.1962)
OKLCH	oklch(45.86% 0.197 275)
XYZ	xyz(13.6177, 8.6174, 51.9742)
Luminance	0.0862 (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

#3F40C2 #C2C13F

analogous

#3F81C2 #3F40C2 #7F3FC2

triadic

#3F40C2 #C23F40 #40C23F

tetradic

#3F40C2 #C23F81 #C2C13F #3FC27F

square

#3F40C2 #C23F81 #C2C13F #3FC27F

split-complementary

#3F40C2 #C27F3F #81C23F

monochromatic

#202166 #2F3095 #3F40C2 #6D6ED1 #9C9CE0

Accessibility & contrast

On white

7.71

#3F40C2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.72

#3F40C2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40C2

7.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40C2	#FFFFFF	#000000	##FFFFFF
##3F40C2	1.00	7.71	2.72	7.71
#FFFFFF	7.71	1.00	21.00	1.00
#000000	2.72	21.00	1.00	21.00
##FFFFFF	7.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059C6

Deuteranopia (green-blind)

#004DC0

Tritanopia (blue-blind)

#00637B

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f40c2;
/* rgb */ color: rgb(63, 64, 194);
/* oklch */ color: oklch(45.9% 0.197 275.0);

Tailwind

colors: {
  custom: {
    50: '#8575d6',
    500: '#3f40c2',
    950: '#000000',
  },
}

SCSS

$custom: #3f40c2;
$custom-light: #8575d6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40c2",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 194
  },
  "hsl": {
    "h": 239.542,
    "s": 51.779,
    "l": 50.392
  },
  "oklch": {
    "l": 0.45861,
    "c": 0.19701,
    "h": 275
  },
  "luminance": 0.08619
}

Semantic roles & 50–950 ramp

primary

#3F40C2

secondary

#CCCB91

accent

#DA4DDB

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40C2

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

Preview Lab → · Contrast checker → · Palette generator →