SplitOn

Split bills, settle debts instantly, and manage shared pool funds with friends — all in one simple, fast app.

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Inspiration

Splitting bills with friends or roommates is always messy — who owes what, who's supposed to pay whom, it gets confusing fast. That's why we built SplitOn — a clean app that handles splitting, settling, and even shared pool funds in one place.

What it does

  • Splits bills within groups and tracks running balances
  • Smart debt-simplification algorithm settles "who owes whom" in one tap
  • Pool Fund feature — a shared fund where one member (the holder) manages contributions from the group
  • Real-time Insights with charts/graphs to visualize spending patterns
  • App Lock (biometric) to keep your data private

How we built it

  • Frontend: React Native (Expo Router)
  • Backend: FastAPI (Python), deployed on Render
  • Database/Auth: Supabase
  • Push notifications: Firebase FCM
  • OCR (bill scanning): Google Cloud Vision API

Challenges we ran into

  • Keeping settlement/debt-simplification logic identical across frontend and backend
  • Fixing real-time balance updates and stale-data bugs
  • Upgrading from Expo SDK 52 to SDK 54 (React 19, RN 0.81) and resolving peer-dependency conflicts

Accomplishments that we're proud of

  • Ported 25+ pixel-perfect screens
  • Completed closed testing with 12-15 real users
  • Built Pool Fund — a feature that sets us apart from typical bill-splitters

What's next for SplitOn

  • Pool Fund insights screen
  • Group ownership transfer feature
  • Use Voice to add Expense

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