My partner and I are buying a house together and we want to keep track of how much of the house belongs to who. We will record all expenses we pay towards the house (surveying, deposit, mortgage payments, repairs etc), and that will determine what share each of us owns. When we sell the house, we will split the sale price minus expenses according to the same proportion.

As I understand it, Splitwise doesn't quite support this use case, because it mainly focuses on how much people owe each other in the moment. It would be great though if you could add a "shared asset" feature like this, where you could keep track of people's proportional ownership of an item over a long period of time.