What are some alternatives?
When comparing Whimsical Mind Maps and Hassl, you can also consider the following products
Mind Map by RealtimeBoard - More than your average mind map
productboard - Beautiful and powerful product management.
Iris - The fastest web framework for Go in (THIS) earth
Transno - Only one tap transforms a note to mind map
Atina - Simple project management tool
Mind Mapped - Create mind maps on the blockchain