Paranoid for Android analyzes all the apps installed on your device to identify apps which could be spying on you. It does this by analyzing the combination of permissions granted to each app. For example, an app which can determine your exact location is fine: an app that can determine your location and report it back to someone else using SMS or the internet is more risky. A well-known messaging app which also tracks your location and your phone calls for no valid reason is definitely quest