Ledger

Shared expenses, settled.

Ledger keeps track of who paid for what and who owes whom. For the flat, the trip, and anything split more than once.

Every split, not just even ones
Shares, percentages, exact amounts.
Balances that make sense
See the real chain, or net it down to the fewest payments.
Receipts that file themselves
Photograph the bill; the expense fills itself in.