#3F40CF#3F40CF

#3F40CF is a mid, highly saturated blue. Relative luminance 0.092; OKLCH L 47.1% C 0.213 H 274.2°. Best body text is #FFFFFF at 7.38:1 contrast (WCAG AA passes).

Color values

HEX	#3F40CF
RGB	rgb(63, 64, 207)
HSL	hsl(240, 60%, 53%)
HSV	hsv(240, 70%, 81%)
CMYK	cmyk(69.6%, 69.1%, 0%, 18.8%)
CIE-LAB	lab(36.42, 45.11, -73.59)
CIE-LCH	lch(36.42, 86.32, 301.51°)
OKLab	oklab(47.07% 0.0157 -0.2127)
OKLCH	oklch(47.07% 0.213 274.2)
XYZ	xyz(15.1420, 9.2271, 60.0024)
Luminance	0.0923 (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

#3F40CF #CFCE3F

analogous

#3F88CF #3F40CF #863FCF

triadic

#3F40CF #CF3F40 #40CF3F

tetradic

#3F40CF #CF3F88 #CFCE3F #3FCF86

square

#3F40CF #CF3F88 #CFCE3F #3FCF86

split-complementary

#3F40CF #CF863F #88CF3F

monochromatic

#1E1E76 #2A2BA7 #3F40CF #7071DB #A1A1E7

Accessibility & contrast

On white

7.38

#3F40CF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.85

#3F40CF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40CF

7.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40CF	#FFFFFF	#000000	##FFFFFF
##3F40CF	1.00	7.38	2.85	7.38
#FFFFFF	7.38	1.00	21.00	1.00
#000000	2.85	21.00	1.00	21.00
##FFFFFF	7.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CD3

Deuteranopia (green-blind)

#004FCC

Tritanopia (blue-blind)

#006783

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f40cf;
/* rgb */ color: rgb(63, 64, 207);
/* oklch */ color: oklch(47.1% 0.213 274.2);

Tailwind

colors: {
  custom: {
    50: '#8776df',
    500: '#3f40cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f40cf;
$custom-light: #8776df;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40cf",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 207
  },
  "hsl": {
    "h": 239.583,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.47074,
    "c": 0.21329,
    "h": 274.2
  },
  "luminance": 0.09229
}

Semantic roles & 50–950 ramp

primary

#3F40CF

secondary

#D4D496

accent

#E245E3

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40CF

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

Preview Lab → · Contrast checker → · Palette generator →