A method and a system for testing an application across platforms. Application testing for checking functionality of an application is carried out to insure that same applications have the same behavior on different platforms. Such platforms include function, user interface (UI), and generated data. One embodiment of the present invention provides a method for cross-platform application testing. A first response to an action is determined on a first platform. The action is triggered on a second platform, the second platform being different from the first platform. Then, a second response is determined to the action on the second platform. Finally, the first response and the second response are compared to test consistency of the application on the first platform and the second platform. A corresponding system for testing an application across platforms is also provided.