I built a group payments app solo, launching on Product Hunt this Tuesday
I'm Simon, a solo indie developer. I just finished building FairPay, a mobile app (iOS) that lets friend groups create shared expenses and actually pay each other, all in one place.
The problem I kept running into: most expense-splitting apps only track who owes what. To actually send the money, you need a second app. Nobody wants to manage two apps for one problem.
FairPay combines the tracking and the payments in a single flow. You create a group, add expenses, and settle up with real money moving without ever leaving the app. Powered by Stripe Connect.
One thing that makes it different: only the group creator needs the app. Participants can pay their share directly via a link, no download required.
The stack:
- Expo SDK 54 + React Native + TypeScript + expo-router
- Supabase (Postgres + RLS + Realtime + Edge Functions)
- Stripe Connect + PaymentSheet + webhooks
- Immutable payment ledger, idempotent transactions, RLS on every sensitive table
Current numbers (no marketing, no launch yet):
- 72 users registered
- 29 groups created
- 15 real payments completed via Stripe
- Built completely solo — no team, no co-founder
- App Store approved ✅
- Pre-launch audit: 95/100 functional, 92/100 UI/UX
Launching on Product Hunt this Tuesday. If you're curious, I'd love feedback, criticism, or just a vote 🙏
🔗 App Store: https://apps.apple.com/us/app/fairpay-split-expenses/id6756900290
🚀 Product Hunt: https://www.producthunt.com/posts/fairpay-2/maker-invite?code=AN4EDN
What's the biggest mistake you made getting your first users? Genuinely asking.
