#3F40CC#3F40CC

#3F40CC is a mid, highly saturated blue. Relative luminance 0.091; OKLCH L 46.8% C 0.210 H 274.4°. Best body text is #FFFFFF at 7.46:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CC
RGB	rgb(63, 64, 204)
HSL	hsl(240, 58%, 52%)
HSV	hsv(240, 69%, 80%)
CMYK	cmyk(69.1%, 68.6%, 0%, 20%)
CIE-LAB	lab(36.14, 44.12, -72.31)
CIE-LCH	lch(36.14, 84.71, 301.39°)
OKLab	oklab(46.79% 0.0161 -0.209)
OKLCH	oklch(46.79% 0.21 274.4)
XYZ	xyz(14.7788, 9.0818, 58.0892)
Luminance	0.0908 (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

#3F40CC #CCCB3F

analogous

#3F87CC #3F40CC #843FCC

triadic

#3F40CC #CC3F40 #40CC3F

tetradic

#3F40CC #CC3F87 #CCCB3F #3FCC84

square

#3F40CC #CC3F87 #CCCB3F #3FCC84

split-complementary

#3F40CC #CC843F #87CC3F

monochromatic

#1E1F72 #2B2CA3 #3F40CC #6F70D9 #A0A0E6

Accessibility & contrast

On white

7.46

#3F40CC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.82

#3F40CC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CC

7.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CC	#FFFFFF	#000000	##FFFFFF
##3F40CC	1.00	7.46	2.82	7.46
#FFFFFF	7.46	1.00	21.00	1.00
#000000	2.82	21.00	1.00	21.00
##FFFFFF	7.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CD0

Deuteranopia (green-blind)

#004EC9

Tritanopia (blue-blind)

#006681

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f40cc;
/* rgb */ color: rgb(63, 64, 204);
/* oklch */ color: oklch(46.8% 0.210 274.4);

Tailwind

colors: {
  custom: {
    50: '#8776dd',
    500: '#3f40cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f40cc;
$custom-light: #8776dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40cc",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 204
  },
  "hsl": {
    "h": 239.574,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.4679,
    "c": 0.20958,
    "h": 274.4
  },
  "luminance": 0.09083
}

Semantic roles & 50–950 ramp

primary

#3F40CC

secondary

#D2D295

accent

#E047E1

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CC

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

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