REX works on both Apple (iPhone, iPad, Mac) and Windows (MS Surface, etc.) based products. When selecting the devices you wish to run REX on, always remember that the speed of your device will affect REX’s performance. As a result, we generally do not recommend using REX on any portable device older than 3 years. Also, if you wish to be mobile, remember to make sure your device has the ability to connect to the internet with a cellular data plan. If you need help deciding what products to buy, please give us a call or send us an email. We do have a REX Veterinary Software account with Apple. With this account, we are offered a small discount on Apple products. Please contact us so we can connect you with our Apple representative.