A:AnswerI don't know about Roku. I have mine connected to an Apple TV box. I bet it would work with your Roku. I know the TV supports Netflix and Amazon Prime and HBO.
A:AnswerThere is a limited number of applications built into the SmartCast screen. We are continually evaluating new applications for addition to the SmartCast screen. In the meantime, you can cast any of the thousands of Chromecast enabled applications to the television from your mobile devices.