Splitter

I wanted an alternative to Splitwise’s free tier. Splitter also became a way to learn how to ship a web app, deploy a backend and work with an AI coding agent.

Each trip has its own participants and base currency. An expense can have several payers and can be split equally, by exact amounts, by percentages or by shares. Receipts stay with their expenses.

The app suggests payments to settle the outstanding balances. People record those payments in the ledger; they make the transfers themselves.

I added family-based settlement so a household can settle as a unit. Individual expenses still belong to the people who paid them, but suggested payments use each family’s combined balance.

Unpaid balances can carry into a later trip as opening balances. That means a group can keep travelling together without having to settle every last amount between trips.

An optional AI comment reacts to a newly added expense with a short quip. It adds a little group-chat humour to the ledger; the balances come from the expense calculations.

Exchange rates are saved when an entry is made, so later rate changes do not rewrite the trip’s history. A finished trip can still have unpaid balances. Keeping those states separate makes it possible to finish recording expenses and settle up afterwards.