#3F37BC#3F37BC

#3F37BC is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.9% C 0.199 H 277.0°. Best body text is #FFFFFF at 8.45:1 contrast (WCAG AA passes).

Color values

HEX	#3F37BC
RGB	rgb(63, 55, 188)
HSL	hsl(244, 55%, 48%)
HSV	hsv(244, 71%, 74%)
CMYK	cmyk(66.5%, 70.7%, 0%, 26.3%)
CIE-LAB	lab(32.74, 44.11, -68.54)
CIE-LCH	lch(32.74, 81.50, 302.76°)
OKLab	oklab(43.9% 0.0242 -0.1979)
OKLCH	oklch(43.9% 0.199 277)
XYZ	xyz(12.4902, 7.4189, 48.3410)
Luminance	0.0742 (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

#3F37BC #B4BC37

analogous

#3771BC #3F37BC #8137BC

triadic

#3F37BC #BC3F37 #37BC3F

tetradic

#3F37BC #BC3771 #B4BC37 #37BC81

square

#3F37BC #BC3771 #B4BC37 #37BC81

split-complementary

#3F37BC #BC8137 #71BC37

monochromatic

#1F1B5D #2F298D #3F37BC #6760D0 #948FDE

Accessibility & contrast

On white

8.45

#3F37BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#3F37BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BC

8.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37BC	#FFFFFF	#000000	##FFFFFF
##3F37BC	1.00	8.45	2.48	8.45
#FFFFFF	8.45	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053C0

Deuteranopia (green-blind)

#0047BA

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f37bc;
/* rgb */ color: rgb(63, 55, 188);
/* oklch */ color: oklch(43.9% 0.199 277.0);

Tailwind

colors: {
  custom: {
    50: '#846fd1',
    500: '#3f37bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f37bc;
$custom-light: #846fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37bc",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 188
  },
  "hsl": {
    "h": 243.609,
    "s": 54.733,
    "l": 47.647
  },
  "oklch": {
    "l": 0.43897,
    "c": 0.1994,
    "h": 277
  },
  "luminance": 0.0742
}

Semantic roles & 50–950 ramp

primary

#3F37BC

secondary

#C5C986

accent

#DE4AD5

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3F37BC

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

Preview Lab → · Contrast checker → · Palette generator →