Monitoring user workload during task performance is a relevant and widely investigated topic in the aviation field of study due to its associations with the level of safety and number of human errors. The current study aims at assessing the workload of pilots wearing sensors while performing typical fly operations. To this purpose, a mobile app able to record physiological measures while performing usability studies with multiple users, even remotely, is provided. Results coming from a preliminary test with three pilots reveal the usefulness of the app in the evaluation of the workload level for each participant and each task.