#3F45C7#3F45C7

#3F45C7 is a mid, vivid blue. Relative luminance 0.094; OKLCH L 47.1% C 0.198 H 273.9°. Best body text is #FFFFFF at 7.27:1 contrast (WCAG AA passes).

Color values

HEX	#3F45C7
RGB	rgb(63, 69, 199)
HSL	hsl(237, 55%, 51%)
HSV	hsv(237, 68%, 78%)
CMYK	cmyk(68.3%, 65.3%, 0%, 22%)
CIE-LAB	lab(36.81, 39.44, -68.31)
CIE-LCH	lch(36.81, 78.88, 300.00°)
OKLab	oklab(47.14% 0.0133 -0.1972)
OKLCH	oklch(47.14% 0.198 273.9)
XYZ	xyz(14.4834, 9.4352, 55.0797)
Luminance	0.0944 (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

#3F45C7 #C7C13F

analogous

#3F89C7 #3F45C7 #7D3FC7

triadic

#3F45C7 #C73F45 #45C73F

tetradic

#3F45C7 #C73F89 #C7C13F #3FC77D

square

#3F45C7 #C73F89 #C7C13F #3FC77D

split-complementary

#3F45C7 #C77D3F #89C73F

monochromatic

#20236C #2D329B #3F45C7 #6E73D5 #9EA1E3

Accessibility & contrast

On white

7.27

#3F45C7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.89

#3F45C7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45C7

7.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45C7	#FFFFFF	#000000	##FFFFFF
##3F45C7	1.00	7.27	2.89	7.27
#FFFFFF	7.27	1.00	21.00	1.00
#000000	2.89	21.00	1.00	21.00
##FFFFFF	7.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005DCB

Deuteranopia (green-blind)

#0050C5

Tritanopia (blue-blind)

#006780

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f45c7;
/* rgb */ color: rgb(63, 69, 199);
/* oklch */ color: oklch(47.1% 0.198 273.9);

Tailwind

colors: {
  custom: {
    50: '#8579d9',
    500: '#3f45c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f45c7;
$custom-light: #8579d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45c7",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 199
  },
  "hsl": {
    "h": 237.353,
    "s": 54.839,
    "l": 51.373
  },
  "oklch": {
    "l": 0.47138,
    "c": 0.19769,
    "h": 273.9
  },
  "luminance": 0.09437
}

Semantic roles & 50–950 ramp

primary

#3F45C7

secondary

#CFCC93

accent

#D84ADE

background

#F8F7FD

surface

#F0EDFB

border

#CBC8D4

text

#0D0915

muted

#7D7B83

Preview Lab

Preview with #3F45C7

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

Preview Lab → · Contrast checker → · Palette generator →