TechAssistant by RATIONAL AG is an Android app that provides access to the most important information about cooking systems iCombi Pro, iCombi Classic, iVario, SelfCookingCenter, CombiMaster Plus, and VarioCookingCenter. The app allows users to search for device-specific information, including circuit diagrams, service parts, and additional information. One can type in the last seven digits of the unit's serial number or scan it from the typeplate to get unit-specific information. Additionally, the app offers access to important documents such as training manuals, installation instructions, technical videos, and more.

The app also provides a condensed overview of messages and information about the cooking systems in the Service Reference section. Users can manage some settings of the cooking systems in the Option Management section. The app also has a Message section where users can receive messages on new and/or updated information. For RATIONAL-certified and trained technicians working on ships, the app offers an additional Marine Support section to help them find a RATIONAL Service Partner worldwide or contact RATIONAL Technical Support directly. To log in to the TechAssistant App, users need access data for the RATIONAL business customer portal. Overall, TechAssistant is a comprehensive app for cooking system information that is easy to use and navigate.