Debug version of a deployed app Debugging methods and tools are available for the debug versions of standalone apps. Create a debug version of a deployed appBy default, the mobile app is built in release mode, which cannot be debugged. To build an app in debug mode, you must check the Mobile Debug Package environment set, which sets the DEBUG_PACKAGE environment variable to 1.Run a debug version of a deployed appAfter deploying the debug version of the app to your device, you must start the app in order to use the debug tools.