#3F37C7#3F37C7

#3F37C7 is a dark, highly saturated blue. Relative luminance 0.079; OKLCH L 45.0% C 0.213 H 276.0°. Best body text is #FFFFFF at 8.13:1 contrast (WCAG AA passes).

Color values

HEX	#3F37C7
RGB	rgb(63, 55, 199)
HSL	hsl(243, 57%, 50%)
HSV	hsv(243, 72%, 78%)
CMYK	cmyk(68.3%, 72.4%, 0%, 22%)
CIE-LAB	lab(33.80, 47.65, -73.25)
CIE-LCH	lch(33.80, 87.39, 303.04°)
OKLab	oklab(44.97% 0.0223 -0.2117)
OKLCH	oklch(44.97% 0.213 276)
XYZ	xyz(13.7215, 7.9114, 54.8257)
Luminance	0.0791 (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

#3F37C7 #BFC737

analogous

#3777C7 #3F37C7 #8737C7

triadic

#3F37C7 #C73F37 #37C73F

tetradic

#3F37C7 #C73777 #BFC737 #37C787

square

#3F37C7 #C73777 #BFC737 #37C787

split-complementary

#3F37C7 #C78737 #77C737

monochromatic

#211C67 #302A97 #3F37C7 #6D66D5 #9B96E2

Accessibility & contrast

On white

8.13

#3F37C7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.58

#3F37C7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37C7

8.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37C7	#FFFFFF	#000000	##FFFFFF
##3F37C7	1.00	8.13	2.58	8.13
#FFFFFF	8.13	1.00	21.00	1.00
#000000	2.58	21.00	1.00	21.00
##FFFFFF	8.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056CB

Deuteranopia (green-blind)

#0049C4

Tritanopia (blue-blind)

#00607C

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3f37c7;
/* rgb */ color: rgb(63, 55, 199);
/* oklch */ color: oklch(45.0% 0.213 276.0);

Tailwind

colors: {
  custom: {
    50: '#8770d9',
    500: '#3f37c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f37c7;
$custom-light: #8770d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37c7",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 199
  },
  "hsl": {
    "h": 243.333,
    "s": 56.693,
    "l": 49.804
  },
  "oklch": {
    "l": 0.44969,
    "c": 0.21287,
    "h": 276
  },
  "luminance": 0.07913
}

Semantic roles & 50–950 ramp

primary

#3F37C7

secondary

#CACD8C

accent

#E048D8

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0715

muted

#7E7A83

Preview Lab

Preview with #3F37C7

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

Preview Lab → · Contrast checker → · Palette generator →