When I was the principal case manager for the Health Technology study at PeaceHealth, I learned the benefits of smart phone apps. Clients who used the apps consistently learned mindfulness techniques and were supported to develop new behaviors to address the challenges hearing voices, depression, and psychosis can bring. Here are some very useful apps reviewed by the Anxiety and Depression Association. https://adaa.org/finding-help/mobile-apps
I particularly like Amanda Aouthworth's (a 15 year old!) efforts!