We present SNIFFPHONE, a handy and easy-to-use device that allows the non-invasive detection of gastric diseases. It analyzes the user’s exhaled breath using specifically developed gas sensors. The device is coupled to a smartphone, which governs the breath analysis process, sends the data measurements to an external data analysis server, and finally gives feedback to the user. In this work, we describe the SNIFFPHONE device and the general platform under development.