#663B91#663B91

#663B91 is a dark, vivid violet. Relative luminance 0.080; OKLCH L 44.6% C 0.139 H 304.4°. Best body text is #FFFFFF at 8.08:1 contrast (WCAG AA passes).

Color values

HEX	#663B91
RGB	rgb(102, 59, 145)
HSL	hsl(270, 42%, 40%)
HSV	hsv(270, 59%, 57%)
CMYK	cmyk(29.7%, 59.3%, 0%, 43.1%)
CIE-LAB	lab(33.98, 36.48, -40.54)
CIE-LCH	lch(33.98, 54.53, 311.98°)
OKLab	oklab(44.63% 0.0785 -0.1145)
OKLCH	oklch(44.63% 0.139 304.4)
XYZ	xyz(12.1532, 7.9971, 27.6859)
Luminance	0.0800 (WCAG relative)
Temperature	cool
Family	violet

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#663B91 #66913B

analogous

#3B3B91 #663B91 #913B91

triadic

#663B91 #91663B #3B9166

tetradic

#663B91 #913B3B #66913B #3B9191

square

#663B91 #913B3B #66913B #3B9191

split-complementary

#663B91 #91913B #3B913B

monochromatic

#29183A #472966 #663B91 #8551B8 #A37CCA

Accessibility & contrast

On white

8.08

#663B91 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#663B91 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #663B91

8.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##663B91	#FFFFFF	#000000	##FFFFFF
##663B91	1.00	8.08	2.60	8.08
#FFFFFF	8.08	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#164F94

Deuteranopia (green-blind)

#29508F

Tritanopia (blue-blind)

#5E4C60

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #663b91;
/* rgb */ color: rgb(102, 59, 145);
/* oklch */ color: oklch(44.6% 0.139 304.4);

Tailwind

colors: {
  custom: {
    50: '#9573b2',
    500: '#663b91',
    950: '#000000',
  },
}

SCSS

$custom: #663b91;
$custom-light: #9573b2;
$custom-dark: #000000;

JSON

{
  "hex": "#663b91",
  "rgb": {
    "r": 102,
    "g": 59,
    "b": 145
  },
  "hsl": {
    "h": 270,
    "s": 42.157,
    "l": 40
  },
  "oklch": {
    "l": 0.44633,
    "c": 0.1388,
    "h": 304.4
  },
  "luminance": 0.07997
}

Semantic roles & 50–950 ramp

primary

#663B91

secondary

#94B474

accent

#D25694

background

#F9F7FB

surface

#F2EDF6

border

#CCC8D0

text

#0D0811

muted

#7E7B80

Preview Lab

Preview with #663B91

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

Preview Lab → · Contrast checker → · Palette generator →