I like the idea! However, I don't know much about psychology, so I'd personally be hesitant to create such a product. Certainly "releasing emotions" without a therapist could be somewhat dangerous for some people. And perhaps what actually helped him isn't using the app, but a new sense of purpose or meaning in his life due his discovery of the book and developing the app.
It'd probably be wise to consult an expert on the psychological backgrounds.
It'd probably be wise to consult an expert on the psychological backgrounds.