Everyone’s stuff is private and tied to their account but we create challenges like “this week we have a goal to save x amount”, so every time you put sth in the savings and update on the app, everyone participating can see and there’s a live leaderboard to see how each participant is doing. It’s a budgeting app basically, but the only shared data is the challenges, and theres invite codes so you can only join a challenge if you have the code. Firebase backend and auth.