#663C8B#663C8B

#663C8B is a dark, vivid violet. Relative luminance 0.079; OKLCH L 44.4% C 0.130 H 306.4°. Best body text is #FFFFFF at 8.13:1 contrast (WCAG AA passes).

Color values

HEX	#663C8B
RGB	rgb(102, 60, 139)
HSL	hsl(272, 40%, 39%)
HSV	hsv(272, 57%, 55%)
CMYK	cmyk(26.6%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(33.82, 34.38, -37.11)
CIE-LCH	lch(33.82, 50.59, 312.81°)
OKLab	oklab(44.4% 0.077 -0.1044)
OKLCH	oklch(44.4% 0.13 306.4)
XYZ	xyz(11.7546, 7.9207, 25.3307)
Luminance	0.0792 (WCAG relative)
Temperature	cool
Family	violet

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#663C8B #618B3C

analogous

#3F3C8B #663C8B #8B3C89

triadic

#663C8B #8B663C #3C8B66

tetradic

#663C8B #8B3F3C #618B3C #3C898B

square

#663C8B #8B3F3C #618B3C #3C898B

split-complementary

#663C8B #898B3C #3C8B3F

monochromatic

#271736 #472A60 #663C8B #8551B4 #A37BC6

Accessibility & contrast

On white

8.13

#663C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.58

#663C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #663C8B

8.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##663C8B	#FFFFFF	#000000	##FFFFFF
##663C8B	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)

#214E8E

Deuteranopia (green-blind)

#2F5089

Tritanopia (blue-blind)

#604B5D

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #663c8b;
/* rgb */ color: rgb(102, 60, 139);
/* oklch */ color: oklch(44.4% 0.130 306.4);

Tailwind

colors: {
  custom: {
    50: '#9473ad',
    500: '#663c8b',
    950: '#000000',
  },
}

SCSS

$custom: #663c8b;
$custom-light: #9473ad;
$custom-dark: #000000;

JSON

{
  "hex": "#663c8b",
  "rgb": {
    "r": 102,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 271.899,
    "s": 39.698,
    "l": 39.02
  },
  "oklch": {
    "l": 0.44395,
    "c": 0.12973,
    "h": 306.4
  },
  "luminance": 0.07921
}

Semantic roles & 50–950 ramp

primary

#663C8B

secondary

#8FB073

accent

#D05890

background

#F9F7FA

surface

#F2EDF4

border

#CCC8CE

text

#0D0810

muted

#7E7B7F

Preview Lab

Preview with #663C8B

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

Preview Lab → · Contrast checker → · Palette generator →