We use apps on our phones for just about everything, but can an app make you feel better, sleep more or calm down? The potential for smartphone therapy is enormous, doctors say.

Olusola Ajilore, MD, PhD, discusses the role smart phone apps play in treating depression and the role of telemedicine in treating depression.

Moodnotes app for iOS helps you record your moods to promote better thinking habits.

HAPPIFY Happify doesn’t offer therapy. Instead, it’s a free mood-training program, backed by science and some of the country’s best psychologists.

Another Valley startup, Reflect, calls its therapy offering “the gym for your soul.” Still another, Two Chairs, is a startup that has raised $21 million dollars.

Apps that let users talk to human therapists or keep tabs on their own mental state are making therapy more accessible and affordable ...