Comment by epaga

I really love this (and miss the days when Prezi was simple and straightforward).

I've written an app myself along sort-of similar lines, but it's less a presentation app and more a thought organizer (works on all Apple platforms). https://mindscopeapp.com

I think what proved key for my own "zoomable" UI was cross-linking, search, and speed/snappiness. Make the animations too heavy and it just slows you down. Zumly seems really great in this regard. Well done!