Effective September 19, 2026 — ZoneCycle: HIIT Bike Trainer
ZoneCycle collects no data. There are no accounts, no sign-ins, no analytics, no advertising, and no tracking of any kind. Everything the app knows about you lives on your phone.
ZoneCycle reads your heart rate from a Bluetooth chest strap, from your bike's console, or from your Apple Watch, and power, cadence, and calorie data from your air bike over a direct Bluetooth connection between your phone and your equipment. This data is processed on your device to run your workout and is stored only on your device (and in your device backups) as your workout history. It is never uploaded, shared, or seen by us — the app has no server.
If you tap "Save to Apple Health" on a finished session, ZoneCycle writes that workout — its duration, active energy burned, and average heart rate — into Apple Health. That happens only when you ask for it.
If you use an Apple Watch as your heart-rate source, the ZoneCycle app on your Watch runs a workout session and reads your live heart rate from Apple Health for the duration of the workout. It reads nothing else: not your history, not other apps' data. Those readings are sent from your Watch to your phone to run the workout and are stored only on your device as part of your workout history. The Watch session itself is discarded when the workout ends. Both permissions — writing workouts and reading heart rate — can be changed at any time in the Health app under Apps → ZoneCycle.
Your name, age, and fitness level are used only to calculate your heart-rate zones (using the published Tanaka formula) and never leave your device.
Bluetooth is used solely to connect to your fitness equipment (such as a Rogue Echo Bike console or a Polar heart-rate strap). To find your equipment, the app briefly scans for nearby Bluetooth devices and shows you only the ones whose names look like an air bike or a heart-rate monitor. That scan happens entirely on your phone: nothing about the devices around you is stored after the scan or transmitted anywhere.
The app makes no network requests during normal use. The one exception: tapping the "Tanaka formula" reference link in setup opens Wikipedia in your browser, which is governed by Wikipedia's own privacy policy.
The app collects no data from anyone, children included.
If this policy ever changes, the updated version will be posted at this address.