
New user here. If I invite people in a group, will they be able to see how much other people owed too or will they just see their own share?

Everyone in a group sees everyone’s balances
ShareCost is a shared-ledger app. When you invite people into a group, every member sees every other member’s position — not just their own share. Concretely, an invited member will see:
The only thing scoped to “you” is which settlements you can act on (tap “Settle”) — you can’t mark someone else’s debt as paid. But you can still see it.
