USMLE-Rx is described as 'The app created by First Aid authors' and is an app in the Education & Reference category. There are more than 10 alternatives to USMLE-Rx for Online / Web-based, iPhone, iPad and Android. The best alternative is KenHub. It's not free, so if you're looking for a free alternative, you could try OnlineMedEd or Medcram. Other great apps like USMLE-Rx are Lecturio (Paid), Moof University (Paid), Dr. Najeeb Lectures (Paid) and Pathoma (Paid).