#3F40BF#3F40BF

#3F40BF is a mid, vivid blue. Relative luminance 0.085; OKLCH L 45.6% C 0.193 H 275.2°. Best body text is #FFFFFF at 7.79:1 contrast (WCAG AA passes).

Color values

HEX	#3F40BF
RGB	rgb(63, 64, 191)
HSL	hsl(240, 50%, 50%)
HSV	hsv(240, 67%, 75%)
CMYK	cmyk(67%, 66.5%, 0%, 25.1%)
CIE-LAB	lab(34.97, 39.78, -66.64)
CIE-LCH	lch(34.97, 77.61, 300.83°)
OKLab	oklab(45.59% 0.0176 -0.1924)
OKLCH	oklch(45.59% 0.193 275.2)
XYZ	xyz(13.2842, 8.4840, 50.2176)
Luminance	0.0848 (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

#3F40BF #BFBE3F

analogous

#3F80BF #3F40BF #7E3FBF

triadic

#3F40BF #BF3F40 #40BF3F

tetradic

#3F40BF #BF3F80 #BFBE3F #3FBF7E

square

#3F40BF #BF3F80 #BFBE3F #3FBF7E

split-complementary

#3F40BF #BF7E3F #80BF3F

monochromatic

#212163 #303191 #3F40BF #6D6DCF #9B9BDE

Accessibility & contrast

On white

7.79

#3F40BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.70

#3F40BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40BF

7.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40BF	#FFFFFF	#000000	##FFFFFF
##3F40BF	1.00	7.79	2.70	7.79
#FFFFFF	7.79	1.00	21.00	1.00
#000000	2.70	21.00	1.00	21.00
##FFFFFF	7.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058C3

Deuteranopia (green-blind)

#004CBD

Tritanopia (blue-blind)

#00617A

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f40bf;
/* rgb */ color: rgb(63, 64, 191);
/* oklch */ color: oklch(45.6% 0.193 275.2);

Tailwind

colors: {
  custom: {
    50: '#8475d3',
    500: '#3f40bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f40bf;
$custom-light: #8475d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40bf",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 191
  },
  "hsl": {
    "h": 239.531,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.45587,
    "c": 0.19318,
    "h": 275.2
  },
  "luminance": 0.08485
}

Semantic roles & 50–950 ramp

primary

#3F40BF

secondary

#CAC990

accent

#D94EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40BF

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

Preview Lab → · Contrast checker → · Palette generator →