Mobile AppFor FitCoach
FitCoach — AI Personal Trainer App
Duration
3 Months
Team Size
4 Engineers
The Challenge
Generic fitness apps offer static plans that do not adapt to missed workouts, poor recovery, or plateauing strength — causing 80% of users to churn within 30 days.
The Solution
We built a React Native + Expo app with a custom adaptation engine: if the user logs poor sleep or missed sessions, the LLM re-plans the week. Progression graphs and form-check videos keep users engaged long-term.
Tech Stack
React NativeExpoOpenAISupabaseRevenueCatApple HealthKit
The Impact
090-day retention (industry avg: 18%)
0App Store & Play Store rating
0Active users after 6 months