Ubiquity: The ubiquity of mobile devices has seen a huge increase in the last years. With more than 2 billion mobile devices shipped 2015 and a growing market, such devices also become more important at the workplace. The geo stack: Thanks to its multi-platform nature and its broad feature set QGIS is one of the most widespread open source GIS applications and does a good job on the desktop. A native mobile touch interface for field based data review and acquisition is the missing bit in the open source geo stack. Core requirements: From developing QGIS for Android we have identified the core requirements for mobile applications. More than that, we have identified what must be avoided: complexity, small UI elements and project definition work. Less is more: Thanks to pre-defined modi for tasks like data acquisition and data review users can focus on the task at hand. Clear user interface elements and adaption of tools for touch input while offering great precision for coordinate recording with an intuitive interaction design make it a pleasure to use and an efficient tool. Synchronisation: To bring the data back into your infrastructure from the device we have developed a new offline synchronisation tool to allow seamless data exchange between the device and the existing geo infrastructure.