#663D8D#663D8D

#663D8D is a dark, vivid violet. Relative luminance 0.081; OKLCH L 44.7% C 0.131 H 305.4°. Best body text is #FFFFFF at 8.02:1 contrast (WCAG AA passes).

Color values

HEX	#663D8D
RGB	rgb(102, 61, 141)
HSL	hsl(271, 40%, 40%)
HSV	hsv(271, 57%, 55%)
CMYK	cmyk(27.7%, 56.7%, 0%, 44.7%)
CIE-LAB	lab(34.16, 34.31, -37.80)
CIE-LCH	lch(34.16, 51.05, 312.23°)
OKLab	oklab(44.69% 0.0757 -0.1064)
OKLCH	oklch(44.69% 0.131 305.4)
XYZ	xyz(11.9549, 8.0854, 26.1250)
Luminance	0.0809 (WCAG relative)
Temperature	cool
Family	violet

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#663D8D #648D3D

analogous

#3E3D8D #663D8D #8D3D8C

triadic

#663D8D #8D663D #3D8D66

tetradic

#663D8D #8D3E3D #648D3D #3D8C8D

square

#663D8D #8D3E3D #648D3D #3D8C8D

split-complementary

#663D8D #8C8D3D #3D8D3E

monochromatic

#281838 #472B62 #663D8D #8553B4 #A37DC7

Accessibility & contrast

On white

8.02

#663D8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#663D8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #663D8D

8.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##663D8D	#FFFFFF	#000000	##FFFFFF
##663D8D	1.00	8.02	2.62	8.02
#FFFFFF	8.02	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#204F90

Deuteranopia (green-blind)

#2F508B

Tritanopia (blue-blind)

#5F4C5F

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #663d8d;
/* rgb */ color: rgb(102, 61, 141);
/* oklch */ color: oklch(44.7% 0.131 305.4);

Tailwind

colors: {
  custom: {
    50: '#9474af',
    500: '#663d8d',
    950: '#000000',
  },
}

SCSS

$custom: #663d8d;
$custom-light: #9474af;
$custom-dark: #000000;

JSON

{
  "hex": "#663d8d",
  "rgb": {
    "r": 102,
    "g": 61,
    "b": 141
  },
  "hsl": {
    "h": 270.75,
    "s": 39.604,
    "l": 39.608
  },
  "oklch": {
    "l": 0.44687,
    "c": 0.13059,
    "h": 305.4
  },
  "luminance": 0.08085
}

Semantic roles & 50–950 ramp

primary

#663D8D

secondary

#92B175

accent

#CF5892

background

#F9F7FA

surface

#F2EDF4

border

#CCC8CE

text

#0D0810

muted

#7E7B7F

Preview Lab

Preview with #663D8D

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

Preview Lab → · Contrast checker → · Palette generator →