What are some alternatives?
When comparing Color Palette Generator and ProtoPie, you can also consider the following products
LOL Colors - Curated color palette inspiration.
Invision - Prototyping and collaboration for design teams
Material Palette - Generate and export your Material Design color palette
Framer - Bring your designs to life.
Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.