The ROM Performance Tracker is an app that uses a Bluetooth(BLE) Speed and Cadence Sensor mounted near the machine’s flywheel to track your RPM. It replaces the ROM 4 Minute Workout’s on-board computer. Additionally, it stores previous workouts and creates performance graphs, has links to workout instructional videos, allows the user to perform benchmarking tests and stores the results, and gives the user the ability to email spreadsheets of workouts either to the ROMFab customer support team or to themselves to upload on their own computer. You need to have a Bluetooth speed and cadence sensor to use this app. You can purchase one online or at a bike store.