Mobile health applications are growing rapidly, with 72% of physicians currently using smartphones. The most popular platforms for medical apps are currently the iPhone and Blackberry. In the future, more apps will be developed for Android tablets and Windows Phone 7. Popular current medical apps include Epocrates for drug references, Medscape for extensive medical content and CME, and various clinical apps like Nimble that allow access to electronic health records from mobile devices. Remote monitoring apps are also emerging that allow monitoring patients from ICUs and during childbirth from mobile devices. Future directions include more "web apps" that can be accessed from any device and app stores within electronic health records to facilitate integration.