#3F40DB#3F40DB

#3F40DB is a mid, highly saturated blue. Relative luminance 0.098; OKLCH L 48.2% C 0.228 H 273.5°. Best body text is #FFFFFF at 7.08:1 contrast (WCAG AA passes).

Color values

HEX	#3F40DB
RGB	rgb(63, 64, 219)
HSL	hsl(240, 68%, 55%)
HSV	hsv(240, 71%, 86%)
CMYK	cmyk(71.2%, 70.8%, 0%, 14.1%)
CIE-LAB	lab(37.55, 49.04, -78.65)
CIE-LCH	lch(37.55, 92.69, 301.95°)
OKLab	oklab(48.23% 0.014 -0.2275)
OKLCH	oklch(48.23% 0.228 273.5)
XYZ	xyz(16.6652, 9.8364, 68.0244)
Luminance	0.0984 (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

#3F40DB #DBDA3F

analogous

#3F8EDB #3F40DB #8C3FDB

triadic

#3F40DB #DB3F40 #40DB3F

tetradic

#3F40DB #DB3F8E #DBDA3F #3FDB8C

square

#3F40DB #DB3F8E #DBDA3F #3FDB8C

split-complementary

#3F40DB #DB8C3F #8EDB3F

monochromatic

#191A86 #2324BA #3F40DB #7373E5 #A6A7EE

Accessibility & contrast

On white

7.08

#3F40DB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.97

#3F40DB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40DB

7.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40DB	#FFFFFF	#000000	##FFFFFF
##3F40DB	1.00	7.08	2.97	7.08
#FFFFFF	7.08	1.00	21.00	1.00
#000000	2.97	21.00	1.00	21.00
##FFFFFF	7.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060E0

Deuteranopia (green-blind)

#0051D8

Tritanopia (blue-blind)

#006B89

Achromatopsia (no color)

#585858

Design tokens & code

CSS

--color: #3f40db;
/* rgb */ color: rgb(63, 64, 219);
/* oklch */ color: oklch(48.2% 0.228 273.5);

Tailwind

colors: {
  custom: {
    50: '#8a76e7',
    500: '#3f40db',
    950: '#000000',
  },
}

SCSS

$custom: #3f40db;
$custom-light: #8a76e7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40db",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 219
  },
  "hsl": {
    "h": 239.615,
    "s": 68.421,
    "l": 55.294
  },
  "oklch": {
    "l": 0.48225,
    "c": 0.22791,
    "h": 273.5
  },
  "luminance": 0.09838
}

Semantic roles & 50–950 ramp

primary

#3F40DB

secondary

#DCDB9A

accent

#EA3DEB

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0E0816

muted

#7E7B84

Preview Lab

Preview with #3F40DB

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

Preview Lab → · Contrast checker → · Palette generator →