 Redivax is a mobile smartphone app that provides trustworthy, evidence-based vaccine information to healthcare providers, pharmacists, patients, including parents, and users in 102 countries. The app has been downloaded by 5,142 unique users, with an average of 2.3 screens per session, and is planning for development of an Android-compatible version to increase its market availability. This article was authored by Robert A. Bignacic, Paula M. Frou, Daniel A. Salmon, and others.