Technologies are disclosed herein for enabling communication between an application developer and application testers, and for facilitating application testing. An application to be tested may be modified during ingestion by an application store to include a testing component. When the application is executed by an application tester on a computing device, the testing component provides functionality for assisting the tester with the testing of the application. As one example, the testing component might provide on-screen instructions to the application tester to perform an operation or a sequence of operations in the application that have been defined by the application developer. The testing component might also facilitate direct communication between the application developer and the application tester through screen sharing, one or two-way video chat, text chat, and/or other mechanisms.