Stuttering is a very complex speech disorder that affects around 0.7% of adults while around 5% of the population have stuttered at some point. A large percentage of the affected people tend to speak more fluently when their own speech is played back to their ear with some type of alteration. While this has been done with special devices, smartphones can be used for this purpose. We report on our initial experiences on building such an application and demonstrate problems with delay caused by the lack of real-time support for audio playback in the Android operating system. We also discuss ideas for future work to improve app support for people who stutter.