The difference between the emWave2 and the Inner Balance Trainer is that the Inner Balance App is designed specifically for the iPhone, iPad, and iPod Touch. The emwave2 is a portable, handheld device that allows you to record sessions. In this way, it is possible to reproduce later which situations produced stress and which stimuli produced heart coherence. For a therapeutic setting, the emWave2 is a better option. For simple personal use, the Inner Balance Trainer is preferred.