Woebot, an artificially intelligent chatbot, uses the principles of cognitive-behavioral therapy. I spent two weeks using the tool. Here's how it went.

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 ...