How to build an expense splitter app for iOS
What an expense splitter app needs
- Groups such as a trip or a household, each with members
- Expenses that record who paid and how the cost is split: equally, by exact amounts, or by shares
- Running balances per person and a simplified view of who owes whom
- A settle-up flow that marks debts as paid and can link out to a payment app
- A backend with accounts so shared groups stay in sync across people
- Optional multi-currency support and receipt photos
The defining challenge is the shared, multi-user part. A solo expense splitter is a list; a real one needs accounts, sync, and correct balance math.
How to build it with AppFlight
Describe it in plain English, for example: "An expense splitter where I create a group, add members, and log expenses with who paid and how to split them, equally or by custom amounts. The app shows each person's balance and simplifies who owes whom, and a settle-up screen marks debts paid. Groups should sync between members who sign in." AppFlight plans the screens, generates native SwiftUI, and launches it in a live simulator so you can add an expense and see balances update immediately. Connect Supabase with one click for the database and sign-in, and ask AppFlight to keep shared groups in sync. You iterate by asking for changes in plain language.
Monetization for an expense splitter app
The common model is a free tier with a subscription. Free users get a limited number of groups; the subscription unlocks unlimited groups, receipt scanning, multi-currency conversion, expense exports, and no ads. Add a RevenueCat paywall for the subscription, and use Superwall if you want to test paywall designs without shipping an update. One consideration specific to this niche: settling up moves real money between friends, but Apple lets person-to-person payments happen outside in-app purchase, so you can link to a payment app for the actual transfer while keeping subscriptions on the standard paywall.
Shipping it to the App Store
When the app is ready, AppFlight signs the build, uploads to TestFlight so a group of testers can split real expenses across their devices, then submits to the App Store with metadata and screenshots from the simulator. If Apple rejects the build, AppFlight reads the reason, fixes the issue, and resubmits. Apple reviews every app, so a submission is not the same as an approval, but the whole pipeline runs without you opening Xcode.
FAQ
Do I need to code to build an expense splitter app?
No. You describe the app in plain English and AppFlight generates native Swift and SwiftUI for the groups, expenses, and balances screens.
How do shared groups sync between people?
Shared groups need a backend with accounts so several people see the same data. AppFlight has a one-click Supabase connector for the database and auth, which handles the sync.
Can people pay each other inside the app?
Apple allows real-world person-to-person payments outside in-app purchase, so a settle-up flow can link out to a payment app. You do not have to route those payments through in-app purchase.