Knee osteoarthritis can affect everyday life through pain, stiffness, and reduced mobility. These symptoms are not always constant, but can change over time and during daily activities. For this reason, a periodic clinical visit may give only a partial view of the patient’s condition. Wearable sensors connected to a mobile application can therefore support day-to-day monitoring of knee-related signals and, after proper validation, may also allow this monitoring to be extended outside the clinical setting. This thesis presents the design and development of a research-oriented mobile application for a sensorized knee sleeve system intended for knee osteoarthritis monitoring. The application was developed as a modular React Native prototype and was designed to communicate with wearable sensing devices through Bluetooth Low Energy.