- rated a "Killer App" by apps4idevices.com
http://apps4idevices.com/read/accelerando-metronomo.html

Accelerando Metronomo, an accelerating metronome for the practicing musician, helps musicians with speed-building practice in a relatively hands-free manner. You specify two tempos, and the metronome will gradually accelerate from one tempo to the other (max 600 bpm). This minimizes the need to interrupt finger exercises, and, also very important, it provides a smooth, thorough tempo experience (instead of skipping a few bpm each time a button is pressed, as a typical metronome would require). Other nice features make the app extremely useful, such as "Wave Mode", Tap Tempo, user-selectable sounds, and choice of rhythms. Tempo range is from 20 bpm to 600 bpm. Accelerando Metronomo can also produce steady tempo like a traditional metronome.