Radium is a proprietary Internet radio player application, used for listening to internet radio streams. It emphasizes a minimalist user interface. The application does not have a main window, instead opting to provide the entire user interface through its main menu. Users can either listen to Radium's built-in selection of internet radio networks, or add their own networks provided that their stream URL's are known. The program has been praised for its unobtrusiveness, low system resource usage, and intuitive user interface, but has also been criticized for its lack of recording functionality as of version 2.5.1.