Our foundation just released a free (and opensource) software to monitor Flutter's usage with an iPhone.The concept developed uses a microphone connected to the mobile device to measure and analyze the sound on the Flutter®.We wrote a simple game for motivation and the ability to send the results to your practician.<a href="http://defitech.ch/FlowerForAll-en">http://defitech.ch/FlowerForAll-en</a>Best regardsPierre-Mikael LegrisDefitech foundation