#3F37BD#3F37BD

#3F37BD is a dark, highly saturated blue. Relative luminance 0.075; OKLCH L 44.0% C 0.201 H 276.9°. Best body text is #FFFFFF at 8.42:1 contrast (WCAG AA passes).

Color values

HEX	#3F37BD
RGB	rgb(63, 55, 189)
HSL	hsl(244, 55%, 48%)
HSV	hsv(244, 71%, 74%)
CMYK	cmyk(66.7%, 70.9%, 0%, 25.9%)
CIE-LAB	lab(32.84, 44.43, -68.97)
CIE-LCH	lch(32.84, 82.04, 302.79°)
OKLab	oklab(43.99% 0.0241 -0.1992)
OKLCH	oklch(43.99% 0.201 276.9)
XYZ	xyz(12.5984, 7.4622, 48.9107)
Luminance	0.0746 (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

#3F37BD #B5BD37

analogous

#3772BD #3F37BD #8237BD

triadic

#3F37BD #BD3F37 #37BD3F

tetradic

#3F37BD #BD3772 #B5BD37 #37BD82

square

#3F37BD #BD3772 #B5BD37 #37BD82

split-complementary

#3F37BD #BD8237 #72BD37

monochromatic

#1F1B5E #2F298E #3F37BD #6760D1 #9490DF

Accessibility & contrast

On white

8.42

#3F37BD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.49

#3F37BD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BD

8.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37BD	#FFFFFF	#000000	##FFFFFF
##3F37BD	1.00	8.42	2.49	8.42
#FFFFFF	8.42	1.00	21.00	1.00
#000000	2.49	21.00	1.00	21.00
##FFFFFF	8.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053C1

Deuteranopia (green-blind)

#0047BB

Tritanopia (blue-blind)

#005C76

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f37bd;
/* rgb */ color: rgb(63, 55, 189);
/* oklch */ color: oklch(44.0% 0.201 276.9);

Tailwind

colors: {
  custom: {
    50: '#846fd2',
    500: '#3f37bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f37bd;
$custom-light: #846fd2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37bd",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 189
  },
  "hsl": {
    "h": 243.582,
    "s": 54.918,
    "l": 47.843
  },
  "oklch": {
    "l": 0.43993,
    "c": 0.20064,
    "h": 276.9
  },
  "luminance": 0.07463
}

Semantic roles & 50–950 ramp

primary

#3F37BD

secondary

#C5C986

accent

#DE4AD5

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3F37BD

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

Preview Lab → · Contrast checker → · Palette generator →