What are experimental features?

Every release of the app includes a bunch of hidden features. Some of them I'm still working on, and others I experimented on and decided to stop their development. Out of a dozen experimental features over the years four were promoted to general availability, and a few were removed completely.

Experimental features are getting enabled when the Friends Club license is activated, and the clue appears in the app. I don't advertise or publish the list of those features for several reasons: none of them are guaranteed to work, they all are limited in one way or another, and they may be discontinued at any moment.