#3F40C8#3F40C8

#3F40C8 is a mid, highly saturated blue. Relative luminance 0.089; OKLCH L 46.4% C 0.205 H 274.6°. Best body text is #FFFFFF at 7.56:1 contrast (WCAG AA passes).

Color values

HEX	#3F40C8
RGB	rgb(63, 64, 200)
HSL	hsl(240, 55%, 52%)
HSV	hsv(240, 69%, 78%)
CMYK	cmyk(68.5%, 68%, 0%, 21.6%)
CIE-LAB	lab(35.78, 42.79, -70.58)
CIE-LCH	lch(35.78, 82.54, 301.23°)
OKLab	oklab(46.42% 0.0166 -0.2039)
OKLCH	oklch(46.42% 0.205 274.6)
XYZ	xyz(14.3052, 8.8924, 55.5949)
Luminance	0.0889 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue Blue

#2242C7

ΔE00 2.88

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40C8 #C8C73F

analogous

#3F85C8 #3F40C8 #833FC8

triadic

#3F40C8 #C83F40 #40C83F

tetradic

#3F40C8 #C83F85 #C8C73F #3FC883

square

#3F40C8 #C83F85 #C8C73F #3FC883

split-complementary

#3F40C8 #C8833F #85C83F

monochromatic

#1F206D #2D2E9D #3F40C8 #6F6FD6 #9E9FE3

Accessibility & contrast

On white

7.56

#3F40C8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3F40C8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40C8

7.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40C8	#FFFFFF	#000000	##FFFFFF
##3F40C8	1.00	7.56	2.78	7.56
#FFFFFF	7.56	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ACC

Deuteranopia (green-blind)

#004EC5

Tritanopia (blue-blind)

#00657F

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f40c8;
/* rgb */ color: rgb(63, 64, 200);
/* oklch */ color: oklch(46.4% 0.205 274.6);

Tailwind

colors: {
  custom: {
    50: '#8676da',
    500: '#3f40c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f40c8;
$custom-light: #8676da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40c8",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 200
  },
  "hsl": {
    "h": 239.562,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.46416,
    "c": 0.20458,
    "h": 274.6
  },
  "luminance": 0.08894
}

Semantic roles & 50–950 ramp

primary

#3F40C8

secondary

#D0CF93

accent

#DE49DF

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0815

muted

#7E7B83

Preview Lab

Preview with #3F40C8

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

Preview Lab → · Contrast checker → · Palette generator →