The AO Surgery Reference is a comprehensive portal of surgical knowledge that includes hundreds of surgical procedures and approaches, tools to help make surgical decisions, and access to hundreds of pages of previously published AO material. Developed by the AO Foundation, the reference is now available via iPhone, iPad, and Android apps. This app is a good starting point to access information about the treatment and management of traumatic fractures. According to a recent JBJS survey of orthopaedic surgeons, AO apps were mentioned second to Epocrates as a favorite medical mobile app.