Systems and methods are provided for generating application data from call data. In one implementation, a method includes acquiring call data from a call-data source with a call-data aggregator; modifying a portion of the call data with a call-data modifier; and generating application data from the portion of the call data. Application data may be configured for diagram generation. The diagram may graphically indicate call volume in branches of an interactive voice response (IVR) system map. The diagram may be a flow diagram including a connector associated with a branch of the IVR system map and the connector may have a width proportional to a call volume in the branch of the IVR system map. The diagram may indicate call-portion durations, which may be associated with a phase of a call and which may have a color associated with a phase of a call.