A grill controller device, which remotely controls any type or grill or oven, comprises a circuit board, a plurality of connector, a power supply system, a control panel, a plurality of temperature control units, a plurality of temperature probes, and a speaker. The grill controller device is wirelessly connected with a graphic user interface so an user can wirelessly operate the grill controller device through the graphic user interface. The grill controller device externally attaches to existing grills and ovens. The plurality of temperature control units adjusts a grill temperature and a plurality of meat temperatures according to the user. A plurality of alerts is controlled by control software and the plurality of alerts comprises different functionality relative to different components. The user is able to control total functionality of the existing grills and ovens through the grill controller device while saving time.