There are thousands of consumer health applications (health apps), which run on smartphones, watches, tablets, and other mobile devices. These Health Apps are available for download for general consumers, patients, and healthcare professionals. Currently, there is no governmental agency that provides certification or guidance on health apps, although there are several projects from organizations such as HL7, the FDA, ONC, and OCR that are working to provide guidance. User discrepancy in terms of the validity and safety of the health apps they choose to use are primarily based on ratings or recommendations. This guide seeks to provide a health app decision tree that can assist medical professionals and consumers in making wise choices when using health apps.