Open the App, go to Settings, and tap Restore Purchases. Make sure you are signed in with the same Apple ID you used when you originally purchased a subscription. The restore is free and happens instantly.
The App includes a two-hour free trial starting from the very first time you launch it. During the trial you have full access to all features. Once the trial expires, you will be prompted to subscribe to continue using the App. The trial is granted once per device.
Subscriptions are managed through Apple. To cancel, open the Settings app on your iPhone, tap your name at the top, go to Subscriptions, find Discount Calculator, and tap Cancel Subscription. You will keep access until the end of the current billing period.
Yes. Your calculation history is saved entirely on your device and is never uploaded to any server. We do not have access to your calculations.
Yes. All calculations happen on-device and no internet connection is required. A connection is only needed when making or restoring a purchase.