Repai Trainer

About the project

Repai Trainer is a personalized training app published on the App Store. I designed, built, and launched the product with an Expo/React Native frontend, Supabase backend, OpenAI-powered workout generation, and subscription management through RevenueCat.

Technologies

Features

• 100+ users · Organic content with 30K views
• Personalized workout generation with OpenAI API
• Subscription system (monthly, annual, lifetime) with RevenueCat
• Exercise database integrated with Gymvisual
• Progress tracking and statistics
• Native iOS interface with fluid animations
• Real-time synchronization
• Payment and subscription management in App Store Connect

Technical challenges

• Complete integration of iOS subscription flow with RevenueCat
• Prompt optimization for OpenAI API to generate coherent workouts
• Synchronization state management between app and backend
• Handling different subscription and trial states
• App Store publication and management (reviews, updates, policies)

Learnings

• Complete mobile app development from scratch to production
• Fullstack architecture with React Native and Supabase
• Implementation of payment systems on iOS
• AI API integration in mobile apps
• Product lifecycle management on App Store

Screenshots

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