Specify the unique, technical name of the app, which is used in the App certificates (see   Creating Certificates   ), among other things, to connect the app to your developer account in the various stores. The package name is freely selectable, but it is usually given like an inverted web address. For example; instead of "myapp.sprylab.com", "com.sprylab.myapp" is used for the package name according to the scheme. At best, you should use the same package name for all platforms.