Refund Radar is an iPhone app that watches the deadlines that cost you money: return windows, refunds that haven't arrived, subscriptions and trials before they renew, and warranties. Add a purchase in seconds (the app suggests the return window) and get reminded by push and email, with the lead time you choose. A template letter helps you start the return. Pro connects Gmail or Outlook and reads receipts with AI. EU servers, no ads, no tracking. English & German.