When Stephen Smith started NOCD 11 years ago, he wanted to build an app for people like himself—one of the 8.2 million Americans with obsessive-compulsive disorder (OCD)—to track their symptoms and time their therapy exercises.

Since 2018, NOCD (pronounced “No-CD”) has provided virtual appointments with therapists specializing in OCD-focused exposure and response prevention (ERP) therapy. With more than 140........

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