Most of the WiFi adapter brands are compatible with all the operating systems. However, few are meant only for a particular operating system. Before buying the device, make sure you have read about it, and you are sure that it is compatible with your device. In our review, we have mentioned which devices are compatible with all operating systems and which are not. Also, it is a suggestion to buy the adapter that has universal compatibility, especially if you are going to use the adapter on multiple computer systems. However, if the adapter has to be used with just one operating system, it is safe to buy the adapter that is not universally compatible.