iOS app
SpotterFuel helps you keep training when equipment is taken.
A simple iPhone and iPad fitness companion for finding same-muscle exercise swaps when the equipment you planned to use is busy.
Made for everyday training
Focused features, no account wall, and no hidden services.
SpotterFuel is designed for people who want a lightweight way to adapt in a busy gym. It avoids social feeds, medical claims, subscriptions, ads, and account-based workout storage so users can open the app and find a practical swap right away. An optional one-time SpotterFuel Pro purchase unlocks all swap options and the Also busy filter.
Busy equipment swaps
Pick the muscle you want to train and the equipment that is taken to find same-muscle alternatives.
Exercise coverage
Review the exercise, muscle, and equipment coverage used for same-muscle swap suggestions.
General fitness guidance
Use simple educational suggestions that are not medical advice and do not replace professional coaching.
Private by design
No login, no ads, no HealthKit access, and no workout content sent to a SpotterFuel account server.
Optional SpotterFuel Pro
A one-time Apple in-app purchase can unlock all swap options and the Also busy filter.
App Store URLs
- Marketing URL: https://www.khanhduy.com/spotterfuel
- Support URL: https://www.khanhduy.com/spotterfuel/support
- Privacy URL: https://www.khanhduy.com/spotterfuel/privacy