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Case study · LimitBreaker
A training app that lives on your phone and your wrist.
LimitBreaker is a subscription workout app with training plans, a rehab mode and full workout history. We built the mobile app, the native Apple Watch companion and the web signup flow.
- Web
- iOS
- Apple Watch
- Android · soon
- Wear OS · soon
The challenge
Athletes wanted to train without holding their phone, see their heart rate live and swap exercises when equipment is busy, while the business needed subscriptions that work both on the web and inside the App Store.
What we built
- iOS app with training plans, rehab mode, workout history and exercise alternatives
- Native Apple Watch app that runs the workout and streams heart rate in real time
- Web signup and upgrade flow with card payments and partner discount codes
- In-app subscriptions with receipt validation on our own backend
Engineering highlights
- Live heart rate from the watch through HealthKit workout sessions
- Exercise swaps are remembered per exercise for the next workout
- Available in 7 languages
- Trial, paywall and billing history built in
Tech stack
- React Native / Expo
- Swift / watchOS
- HealthKit
- Stripe
- Nuxt
- Docker
Your project
Building something similar?
Tell us about it. We usually reply within one business day.
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