#3F40BC#3F40BC

#3F40BC is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.3% C 0.189 H 275.4°. Best body text is #FFFFFF at 7.86:1 contrast (WCAG AA passes).

Color values

HEX	#3F40BC
RGB	rgb(63, 64, 188)
HSL	hsl(240, 50%, 49%)
HSV	hsv(240, 66%, 74%)
CMYK	cmyk(66.5%, 66%, 0%, 26.3%)
CIE-LAB	lab(34.71, 38.76, -65.31)
CIE-LCH	lch(34.71, 75.95, 300.69°)
OKLab	oklab(45.32% 0.0179 -0.1885)
OKLCH	oklch(45.32% 0.189 275.4)
XYZ	xyz(12.9574, 8.3533, 48.4967)
Luminance	0.0835 (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

#3F40BC #BCBB3F

analogous

#3F7FBC #3F40BC #7D3FBC

triadic

#3F40BC #BC3F40 #40BC3F

tetradic

#3F40BC #BC3F7F #BCBB3F #3FBC7D

square

#3F40BC #BC3F7F #BCBB3F #3FBC7D

split-complementary

#3F40BC #BC7D3F #7FBC3F

monochromatic

#202160 #30308E #3F40BC #6B6CCD #9999DD

Accessibility & contrast

On white

7.86

#3F40BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.67

#3F40BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40BC

7.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40BC	#FFFFFF	#000000	##FFFFFF
##3F40BC	1.00	7.86	2.67	7.86
#FFFFFF	7.86	1.00	21.00	1.00
#000000	2.67	21.00	1.00	21.00
##FFFFFF	7.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057C0

Deuteranopia (green-blind)

#004CBA

Tritanopia (blue-blind)

#006078

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f40bc;
/* rgb */ color: rgb(63, 64, 188);
/* oklch */ color: oklch(45.3% 0.189 275.4);

Tailwind

colors: {
  custom: {
    50: '#8475d1',
    500: '#3f40bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f40bc;
$custom-light: #8475d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40bc",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 188
  },
  "hsl": {
    "h": 239.52,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.45315,
    "c": 0.18932,
    "h": 275.4
  },
  "luminance": 0.08354
}

Semantic roles & 50–950 ramp

primary

#3F40BC

secondary

#C9C88E

accent

#D84ED9

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F40BC

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

Preview Lab → · Contrast checker → · Palette generator →