I have already created (via app inventor 2) an app that reads a sentence entered by the user. The problem is that this app does not have a "memory" and does not connect to the network. I wanted to make an app. Anyone who has this app can send data that others can see. For example, four people have the app. Each insert (from your smartphone) your name and your score for a given game. The app stores all received data and produces a ranking that will be visible to all users who own quell'app. This was just one example. I hope you have understood. Thank you all.