Abstract: Device, system, and method of interactive communications among mobile devices and Internet Protocol (IP) connected screens. A system enables rapid and efficient generation of an interactive application, that has a screen-side component able to nm on IP-connected screen, and that has a mobile-side component able to run on smartphones, tablets, smart-watches, and other mobile electronic devices. User feedback from an end-Dashboard Module user device, or aggregated user feedback from multiple end-user devices, interacts with and affects the interactive application as displayed on the IP-connected screen. The system enables the interactive application to run and to operate automatically at a sports venue, a digital billboard or digital sign, or at other suitable venues.