Modern tablet computers come with touch sensitive displays, which make them suitable for recognition and evaluation of finger movements. This paper describes the design and development of a prototypical iPad application, which uses this capability to support therapeutic exercises for stroke patients. It is shown how this concept differs from existing stationary solutions, and how the prototype is used to explore the suitability of such a solution for stroke rehabilitation. Experiences from first user trials are described, which indicate willingness of patients and therapists to embrace the new technical possibilities, although challenging research tasks remain to be solved on the way to a proven professional solution.