Try Binaural Beats before you buy !

Binaural Beats & Isochronic have a deferent effect on everybody, so maybe it could work for you or it will not work for you, so try it on YouTube (its free) before you buy this app, because every dose is around 15 min. and every dose cost around $3 - $6 each. Most of all, you must buy good headphones and READ the instructions or it will not work at all. It is a great app but sadly very expansive!

ecotouriste about iDoser Premium, v3.0