In working life today, people often experience high levels of stress and display strong reactions to different stressors. Those who are exposed to high levels of stress for a long time face an increased risk for deterioration in physical and mental health often leading to sick leave and high consumption of healthcare. To prevent this, continuous support is needed. Development of IT-tools for continuous stress management is, however, in its early stages. We present a prototype of a mobile phone app for self-reflection, a tool that is also integrated in a larger web based stress management system built on research of social networks for increased well-being. The mobile phone app aims at helping people become more aware of patterns of stressful events. It logs and displays basic information about self-perceived stress situations, such as location and time, and the user can add information about the situations and perceived stress levels. As the app constitutes a part of the web based stress management system, not only self-reflection but also reflection together with peers and stress experts is possible. The prototype of the mobile phone app has been qualitatively evaluated using stress management criteria, and the paper also exemplifies its utility in the context of the larger system.