#643B8A#643B8A

#643B8A is a dark, vivid violet. Relative luminance 0.077; OKLCH L 43.9% C 0.130 H 305.7°. Best body text is #FFFFFF at 8.29:1 contrast (WCAG AA passes).

Color values

HEX	#643B8A
RGB	rgb(100, 59, 138)
HSL	hsl(271, 40%, 39%)
HSV	hsv(271, 57%, 54%)
CMYK	cmyk(27.5%, 57.2%, 0%, 45.9%)
CIE-LAB	lab(33.29, 34.16, -37.35)
CIE-LCH	lch(33.29, 50.62, 312.45°)
OKLab	oklab(43.93% 0.0756 -0.1052)
OKLCH	oklch(43.93% 0.13 305.7)
XYZ	xyz(11.4060, 7.6723, 24.9199)
Luminance	0.0767 (WCAG relative)
Temperature	cool
Family	violet

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B8A #618A3B

analogous

#3C3B8A #643B8A #8A3B88

triadic

#643B8A #8A643B #3B8A64

tetradic

#643B8A #8A3C3B #618A3B #3B888A

square

#643B8A #8A3C3B #618A3B #3B888A

split-complementary

#643B8A #888A3B #3B8A3C

monochromatic

#261634 #45295F #643B8A #834FB4 #A179C6

Accessibility & contrast

On white

8.29

#643B8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.53

#643B8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B8A

8.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B8A	#FFFFFF	#000000	##FFFFFF
##643B8A	1.00	8.29	2.53	8.29
#FFFFFF	8.29	1.00	21.00	1.00
#000000	2.53	21.00	1.00	21.00
##FFFFFF	8.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F4D8D

Deuteranopia (green-blind)

#2D4E88

Tritanopia (blue-blind)

#5E4A5C

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #643b8a;
/* rgb */ color: rgb(100, 59, 138);
/* oklch */ color: oklch(43.9% 0.130 305.7);

Tailwind

colors: {
  custom: {
    50: '#9373ac',
    500: '#643b8a',
    950: '#000000',
  },
}

SCSS

$custom: #643b8a;
$custom-light: #9373ac;
$custom-dark: #000000;

JSON

{
  "hex": "#643b8a",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 138
  },
  "hsl": {
    "h": 271.139,
    "s": 40.102,
    "l": 38.627
  },
  "oklch": {
    "l": 0.43933,
    "c": 0.12954,
    "h": 305.7
  },
  "luminance": 0.07672
}

Semantic roles & 50–950 ramp

primary

#643B8A

secondary

#8FAF71

accent

#D05892

background

#F9F7FA

surface

#F1EDF4

border

#CBC8CE

text

#0D0810

muted

#7E7B7F

Preview Lab

Preview with #643B8A

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

Preview Lab → · Contrast checker → · Palette generator →