Stulz is a free Android app developed by STULZ GmbH for service technicians to quickly and easily analyze error messages and troubleshoot Mitsubishi Heavy Industries' climate systems. The app's error code analysis feature works offline, making it convenient for on-site troubleshooting.

The app also allows users to request technical support from STULZ's Climate and Humidification Systems division via email directly from the app. Users can add free text and photos to supplement the error code for better diagnosis.

With a demo access, users can explore the app's features. However, full functionality is available only after logging in with their personal e-STULZ credentials.

The S-Klima Support App provides support to service technicians and planners working with S-Klima and Mitsubishi Heavy Industries' products. The app includes a range of features such as error code analysis, support request, refrigerant calculator, compatibility check, DIN EN 378 calculator, and TeamViewer Pilot with augmented-reality functions.