#3F40C0#3F40C0

#3F40C0 is a mid, vivid blue. Relative luminance 0.085; OKLCH L 45.7% C 0.194 H 275.2°. Best body text is #FFFFFF at 7.76:1 contrast (WCAG AA passes).

Color values

HEX	#3F40C0
RGB	rgb(63, 64, 192)
HSL	hsl(240, 51%, 50%)
HSV	hsv(240, 67%, 75%)
CMYK	cmyk(67.2%, 66.7%, 0%, 24.7%)
CIE-LAB	lab(35.06, 40.11, -67.08)
CIE-LCH	lch(35.06, 78.16, 300.88°)
OKLab	oklab(45.68% 0.0175 -0.1937)
OKLCH	oklch(45.68% 0.194 275.2)
XYZ	xyz(13.3946, 8.5281, 50.7992)
Luminance	0.0853 (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

#3F40C0 #C0BF3F

analogous

#3F80C0 #3F40C0 #7F3FC0

triadic

#3F40C0 #C03F40 #40C03F

tetradic

#3F40C0 #C03F80 #C0BF3F #3FC07F

square

#3F40C0 #C03F80 #C0BF3F #3FC07F

split-complementary

#3F40C0 #C07F3F #80C03F

monochromatic

#212164 #303192 #3F40C0 #6D6ECF #9B9CDE

Accessibility & contrast

On white

7.76

#3F40C0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#3F40C0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40C0

7.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40C0	#FFFFFF	#000000	##FFFFFF
##3F40C0	1.00	7.76	2.71	7.76
#FFFFFF	7.76	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058C4

Deuteranopia (green-blind)

#004DBE

Tritanopia (blue-blind)

#00627A

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f40c0;
/* rgb */ color: rgb(63, 64, 192);
/* oklch */ color: oklch(45.7% 0.194 275.2);

Tailwind

colors: {
  custom: {
    50: '#8475d4',
    500: '#3f40c0',
    950: '#000000',
  },
}

SCSS

$custom: #3f40c0;
$custom-light: #8475d4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40c0",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 192
  },
  "hsl": {
    "h": 239.535,
    "s": 50.588,
    "l": 50
  },
  "oklch": {
    "l": 0.45678,
    "c": 0.19446,
    "h": 275.2
  },
  "luminance": 0.08529
}

Semantic roles & 50–950 ramp

primary

#3F40C0

secondary

#CACA91

accent

#D94EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40C0

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

Preview Lab → · Contrast checker → · Palette generator →