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The vision-based detection of hand gestures is one technological enabler for Natural User Interfaces which try to provide a natural and intuitive interaction with computers. In particular, mobile devices might benefit from such a less device-centric but more natural input possibility. In this paper, we introduce our ongoing work on the visual markerless detection of fingertips on mobile devices. Further, we shed light on the potential of mobile hand gesture detection and present several promising use cases and respective demo applications based on the presented engine.