#643F9D

RGB 100, 63, 157

Values

Hex#643F9D

RGB100, 63, 157

HSL264°, 43%, 43%

On White7.66:1

On Black2.74:1

#E9EBE5 background

#242C21 ink

#643F9D accent

#764773 support

#A7A7A0 neutral

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Use these colors:

Background: #E9EBE5 (background)
Ink: #242C21 (ink)
Accent: #643F9D (accent)
Support: #764773 (support)
Neutral: #A7A7A0 (neutral)

Build a design system around this color.