1. A method, comprising: receiving application performance events from a plurality of mobile devices; extracting from the application performance events a particular computer application program identifier and associated version number; calculating a user experience score using application performance data extracted from the application performance events associated with the particular computer application program identifier and associated version number; storing the user experience score for a computer application program associated with the computer application program identifier and the associated version number in a datastore; and causing display of the user experience score or a representation of the user experience score; wherein the method is performed by one or more computing devices.