Using a mobile phone or webcam, you can record the screen of the device used and, at the same time, record the face of the person. This material goes to an application dashboard, so you can then analyze how the session went. With a notebook or mobile phone, you can capture many insights over the course of developing your project. You can download the program at the page https://lookback.io/download; there are several options for devices. Another step is to integrate the prototypes into tools like Invision, Marvel, and Proto; they all have a way of integrating with lookback.