#3F37C0#3F37C0

#3F37C0 is a dark, highly saturated blue. Relative luminance 0.076; OKLCH L 44.3% C 0.204 H 276.6°. Best body text is #FFFFFF at 8.34:1 contrast (WCAG AA passes).

Color values

HEX	#3F37C0
RGB	rgb(63, 55, 192)
HSL	hsl(244, 55%, 48%)
HSV	hsv(244, 71%, 75%)
CMYK	cmyk(67.2%, 71.4%, 0%, 24.7%)
CIE-LAB	lab(33.12, 45.40, -70.27)
CIE-LCH	lch(33.12, 83.66, 302.87°)
OKLab	oklab(44.28% 0.0235 -0.203)
OKLCH	oklch(44.28% 0.204 276.6)
XYZ	xyz(12.9274, 7.5938, 50.6434)
Luminance	0.0760 (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

#3F37C0 #B8C037

analogous

#3773C0 #3F37C0 #8337C0

triadic

#3F37C0 #C03F37 #37C03F

tetradic

#3F37C0 #C03773 #B8C037 #37C083

square

#3F37C0 #C03773 #B8C037 #37C083

split-complementary

#3F37C0 #C08337 #73C037

monochromatic

#201C61 #2F2990 #3F37C0 #6962D2 #9692E0

Accessibility & contrast

On white

8.34

#3F37C0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.52

#3F37C0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37C0

8.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37C0	#FFFFFF	#000000	##FFFFFF
##3F37C0	1.00	8.34	2.52	8.34
#FFFFFF	8.34	1.00	21.00	1.00
#000000	2.52	21.00	1.00	21.00
##FFFFFF	8.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054C4

Deuteranopia (green-blind)

#0048BD

Tritanopia (blue-blind)

#005D78

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3f37c0;
/* rgb */ color: rgb(63, 55, 192);
/* oklch */ color: oklch(44.3% 0.204 276.6);

Tailwind

colors: {
  custom: {
    50: '#856fd4',
    500: '#3f37c0',
    950: '#000000',
  },
}

SCSS

$custom: #3f37c0;
$custom-light: #856fd4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37c0",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 192
  },
  "hsl": {
    "h": 243.504,
    "s": 55.466,
    "l": 48.431
  },
  "oklch": {
    "l": 0.44283,
    "c": 0.20433,
    "h": 276.6
  },
  "luminance": 0.07595
}

Semantic roles & 50–950 ramp

primary

#3F37C0

secondary

#C7CB88

accent

#DF49D6

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0D0714

muted

#7D7A83

Preview Lab

Preview with #3F37C0

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

Preview Lab → · Contrast checker → · Palette generator →