Side quest 02 · Started
Inspired by Splitwise
Shared costs, settled without the spreadsheet.
Split expenses with friends, flatmates and travel groups. Every split method, receipt scanning, currency conversion, charts and exports, all free. No daily limits, no ads.
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Real screens from the app. Pick one to look closer; they follow this site’s light and dark mode.
The story
01The itch
Splitwise is how my friends and I keep track of who paid for what. Then the free plan started capping how many expenses you can add in a day, and a trip with friends produces a lot more than that by lunch.
Receipt scanning, currency conversion, charts and search sit behind Pro too. None of it is complicated. It's all just maths over a list of expenses.
02The quest
The goal was simple: every feature Splitwise has, Pro included, free for everyone and for good. Unlimited expenses, every split method, itemized bills, receipts, conversion, charts, search and export.
I mapped the product from its help centre and public API docs, 27 screens in all, and built the core loop first: add a shared expense, see who owes whom, settle up. The first version, all 27 screens, shipped the same day.
03The hard part
Money has to add up to the paisa. When ₹1,000 is split three ways, someone has to own the extra paisa, every time, in the same way. Multiple payers, percentages that don't sum to 100, and balances across several currencies all have to come out exact.
Simplify debts collapses a web of who-owes-whom into the fewest payments. And like UnMoney, UnSplit works offline: writes go into a durable outbox and sync when you're back, without ever creating duplicates.
04Better together
UnSplit and UnMoney share nothing but your Google account, yet they work as one. Pick the shared entries in UnMoney, tap Split, and UnSplit opens with them filled in. Save the split and UnMoney gets a link back to it.
One app knows what you spent, the other knows who you spent it with.
Nothing locked
Flip between Splitwise and UnSplit to see what stopped being a paywall.
6 paid ·
Add as many as the trip needs. No daily cap.
Snap the bill; items, tax, tip, date and merchant are filled in.
Convert a group to one currency; the original amounts are kept.
Spending by month and by category, per group.
Find any expense by description or note.
Assign each item to the people who had it; tax and tip split in proportion.
Equal, exact, percent, shares, adjustment and reimbursement.
The fewest payments that settle the group.
Under the hood
Integer minor units throughout, deterministic rounding, and multiple payers, verified by unit tests for every split method.
Writes queue durably, temporary ids map to real ones on sync, and idempotency keys make replays safe after a reload.
Claude reads a photo of the bill and returns line items, tax, tip, date and merchant, ready to split item by item.
Convex subscriptions mean a friend's new expense shows up on your screen the moment they save it.
UnSplit knows who you spent with; UnMoney knows what you spent. Shared entries go from UnMoney to UnSplit and come back linked.
Sign in with Google and it’s yours. Install it to your home screen and it works offline too. Found a bug or want a feature? Issues and PRs are welcome.
Join the conversation
Questions, ideas, bug reports or kind words: all welcome.
