PlayCast is the last piece of the puzzle needed to give Roku devices functionality comparable to Chromecast, said Jeff Lawrence, CEO, MediaMall Technologies. With PlayOn and PlayCast, Roku users can now watch nearly any online video on their TV. Even YouTube videos can be cast to the TV with PlayCast.. The free app is available for all new and existing PlayOn customers. However, while the app is free, subscriptions to PlayOn's service is not. Various subscriptions are available at Fall sale prices.