A software application development tool supports a specified design-time data feed. A software application developer can interact with the development tool to specify a design-time data feed that is to be used during development of an application in place of a given run-time data feed that is not available for access by the application. For instance, a software application developer may code the application with reference(s) to the unavailable run-time data feed, and the developer may specify to the development tool a design-time data feed for such referenced run-time data feed. The development tool then manages correlation of the specified design-time feed to the run-time feed such that references to the run-time feed in the application under development instead trigger access to the specified design-time feed by the development tool. When deployed in a run-time environment, the software application's references to the run-time feed trigger access to such run-time feed.