Email support@duadoorapp.com. Include your iPhone model and iOS version (Settings › General › About) and, if it helps, a screenshot. We reply to every message.
Open the Guard tab and tap Blocked Apps, then Choose Apps. Apple's picker lets you select apps, categories, or websites; DuaDoor never sees their names, only what Apple hands it. Choose the apps that pull you in — a guarded app asks for a du'a every time you open it, so messaging apps are usually better left off the list. You can change or clear the selection at any time.
Open Settings in DuaDoor and tap Restore Purchases under Purchases. Make sure the phone is signed in with the same Apple Account you bought with. The screen tells you whether a purchase was found.
Subscriptions are managed by Apple, so DuaDoor can't cancel one for you. On your iPhone go to Settings › [your name] › Subscriptions, choose DuaDoor, and tap Cancel Subscription. You keep access until the end of the period you've paid for. The lifetime purchase is a one-time payment and has nothing to cancel.
No. There are no accounts, no analytics, and no server. Everything stays on your phone — see the privacy policy.