#3F40BE#3F40BE

#3F40BE is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.5% C 0.192 H 275.3°. Best body text is #FFFFFF at 7.81:1 contrast (WCAG AA passes).

Color values

HEX	#3F40BE
RGB	rgb(63, 64, 190)
HSL	hsl(240, 50%, 50%)
HSV	hsv(240, 67%, 75%)
CMYK	cmyk(66.8%, 66.3%, 0%, 25.5%)
CIE-LAB	lab(34.88, 39.44, -66.20)
CIE-LCH	lch(34.88, 77.06, 300.78°)
OKLab	oklab(45.5% 0.0177 -0.1911)
OKLCH	oklch(45.5% 0.192 275.3)
XYZ	xyz(13.1745, 8.4401, 49.6400)
Luminance	0.0844 (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

#3F40BE #BEBD3F

analogous

#3F7FBE #3F40BE #7E3FBE

triadic

#3F40BE #BE3F40 #40BE3F

tetradic

#3F40BE #BE3F7F #BEBD3F #3FBE7E

square

#3F40BE #BE3F7F #BEBD3F #3FBE7E

split-complementary

#3F40BE #BE7E3F #7FBE3F

monochromatic

#212162 #303190 #3F40BE #6C6DCE #9A9ADD

Accessibility & contrast

On white

7.81

#3F40BE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.69

#3F40BE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40BE

7.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40BE	#FFFFFF	#000000	##FFFFFF
##3F40BE	1.00	7.81	2.69	7.81
#FFFFFF	7.81	1.00	21.00	1.00
#000000	2.69	21.00	1.00	21.00
##FFFFFF	7.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058C2

Deuteranopia (green-blind)

#004CBC

Tritanopia (blue-blind)

#006179

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f40be;
/* rgb */ color: rgb(63, 64, 190);
/* oklch */ color: oklch(45.5% 0.192 275.3);

Tailwind

colors: {
  custom: {
    50: '#8475d3',
    500: '#3f40be',
    950: '#000000',
  },
}

SCSS

$custom: #3f40be;
$custom-light: #8475d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40be",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 190
  },
  "hsl": {
    "h": 239.528,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.45496,
    "c": 0.1919,
    "h": 275.3
  },
  "luminance": 0.08441
}

Semantic roles & 50–950 ramp

primary

#3F40BE

secondary

#C9C98F

accent

#D94EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40BE

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

Preview Lab → · Contrast checker → · Palette generator →