The app will not open unless you give it five stars on May 26, 2021, 15:39 13 comments Facepalm: What is the best way to make sure your app has a five-star rating? Make a killer app? Nope. Shady developers have discovered an iOS flaw that allows them to create apps that will not open unless the user gives it a five-star rating on the App Store. Self-proclaimed "Professional AppStore critic" Kosta Eleftheriou spotted an app ("UPNP Xtreme") that uses this bug. He tweeted a demo video showing it in action (below). The review: “This app forced me to give it a good rating before I could use it.”