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An iPhone running iOS 18.6 or later, and nothing else. If you're not sure which version you're on, open the Settings app and look under General, then About.

Yes. You sign in with Apple or with Google, and your workouts, library, and history stay tied to that account. Sign in on a new phone and everything is already there.

It does. Sessions run and save on your phone with no connection, and they sync the next time you're online. The basement gym is not a problem.

If you allow it, Stackt saves each finished session to Apple Health as a workout. It also reads a few numbers back to give your training some context: steps, active energy, heart rate, resting heart rate, and heart rate variability. You can change your mind any time in the Health app under Sharing.

Stackt is free to download, and you can start training with it before paying for anything. Stackt Pro unlocks the full app after that, and the current price for your country is shown in the app before you subscribe.

Not yet. Stackt is iPhone only for now. Email us if you're waiting on Android and we'll let you know when that changes.

Send it. A lot of what's in Stackt started as a message from someone who trains with it, and we read every one of them.

Tell us what you were doing and what happened instead. Your iPhone model and iOS version help us narrow it down, and a screenshot or a screen recording is worth a lot here. Mention whether it happens every time or only now and then.

First check that your iPhone is signed in with the same Apple ID you bought the subscription with. Then open the Stackt Pro screen and restore your purchase from there. If it still won't unlock, email us and we'll sort it out.

Subscriptions run through your Apple ID, so cancelling happens on your iPhone rather than in Stackt. Open the Settings app, tap your name at the top, tap Subscriptions, then Stackt. You keep Pro until the end of the period you already paid for.

Apple handles every payment made in the App Store, refunds included, so those requests go to Apple at reportaproblem.apple.com. Send us a message as well if something on our side caused it.

Email us from the address on your account and ask us to delete it. We'll remove the account along with the workouts, library, and history attached to it. Anything Stackt saved to Apple Health stays in Apple Health, so remove that from the Health app as well if you want it gone.