A quick search for “anxiety,” “depression” or “mental health” in Apple’s App Store or on Google Play returns a dizzying array of results. Offerings include games for stress relief, meditation guides, mood trackers and tools intended to tackle conditions such as post-traumatic stress disorder, obsessive-compulsive disorder, schizophrenia and more. But regardless of function, many of these apps tout variations of the same promise: They’ll help you feel better.