Split The Bill (STB)

Split The Bill works out who owes whom after a shared trip, barbecue, house rental or road trip. You create a party, add the people, enter expenses as they happen, and it calculates a final settlement with the fewest transfers between participants, so a group of friends does not end up with a web of small debts. Results can be shared with the group, and past calculations stay saved.

It works fully offline with no accounts or registration, which also means nobody else edits the expenses: one person runs the calculation for the group. Its own tagline is Fair enough. Probably. Friends who travel together and want the maths done without a spreadsheet will find it does exactly that, and nothing more.