#3F40BD#3F40BD

#3F40BD is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.4% C 0.191 H 275.4°. Best body text is #FFFFFF at 7.84:1 contrast (WCAG AA passes).

Color values

HEX	#3F40BD
RGB	rgb(63, 64, 189)
HSL	hsl(240, 50%, 49%)
HSV	hsv(240, 67%, 74%)
CMYK	cmyk(66.7%, 66.1%, 0%, 25.9%)
CIE-LAB	lab(34.80, 39.10, -65.76)
CIE-LCH	lch(34.80, 76.50, 300.74°)
OKLab	oklab(45.41% 0.0178 -0.1898)
OKLCH	oklch(45.41% 0.191 275.4)
XYZ	xyz(13.0656, 8.3965, 49.0664)
Luminance	0.0840 (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

#3F40BD #BDBC3F

analogous

#3F7FBD #3F40BD #7D3FBD

triadic

#3F40BD #BD3F40 #40BD3F

tetradic

#3F40BD #BD3F7F #BDBC3F #3FBD7D

square

#3F40BD #BD3F7F #BDBC3F #3FBD7D

split-complementary

#3F40BD #BD7D3F #7FBD3F

monochromatic

#202161 #30308F #3F40BD #6B6CCE #999ADD

Accessibility & contrast

On white

7.84

#3F40BD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#3F40BD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40BD

7.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40BD	#FFFFFF	#000000	##FFFFFF
##3F40BD	1.00	7.84	2.68	7.84
#FFFFFF	7.84	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058C1

Deuteranopia (green-blind)

#004CBB

Tritanopia (blue-blind)

#006179

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f40bd;
/* rgb */ color: rgb(63, 64, 189);
/* oklch */ color: oklch(45.4% 0.191 275.4);

Tailwind

colors: {
  custom: {
    50: '#8475d2',
    500: '#3f40bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f40bd;
$custom-light: #8475d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40bd",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 189
  },
  "hsl": {
    "h": 239.524,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.45405,
    "c": 0.19061,
    "h": 275.4
  },
  "luminance": 0.08398
}

Semantic roles & 50–950 ramp

primary

#3F40BD

secondary

#C9C98F

accent

#D84EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40BD

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

Preview Lab → · Contrast checker → · Palette generator →