metroGnome was created to meet a simple need that we had. During our work on the Qualcomm Tricorder X-Prize we ran into a testing problem. We could not find a metronome that would work with very slow rates. This was needed to help simulate patients with sleep apnea, COPD and other respiratory problems. metroGnome was a simple solution that we thought might be of some use to others looking for a timer that could do very low beats-per-minute.