These apps and downloads can provide a great introduction to hypnosis and do have some anecdotal evidence suggesting a level of success. However they have been cited by hypnotherapists as being less compared successful to in person sessions. They widely state that the prerecorded hypnosis downloads cannot be tailored to your specific needs and cannot adapt to your reactions to the therapy while the session is in progress.
Hypnotherapy is guided hypnosis, or a trance-like state of focus and concentration achieved with the help of a clinical hypnotherapist. This trance-like state is similar to being completely absorbed in a book, movie, music, or even one's own thoughts or meditations. In this state, clients can turn their attention completely inward to find and utilize the natural resources deep within themselves that can help them make changes or regain control in certain areas of their life.