An unsupported event module may install one or more event handlers in an application, wherein the one or more event handlers are configured to catch user interface events not otherwise handled by the application. During execution of the application, one or more unsupported event handlers may record user interface events not otherwise handled by the application. The method further includes storing or transmitting one or more records of the user interface events recorded by the one or more unsupported event handlers. Other embodiments may include receiving, from a plurality of remote computing devices, records of user interface events. The recorded user interface events from a plurality of computers implementing instances of an application may be aggregated to generate a report indicting the number of user interface events not otherwise handled for the application.