Roku Cast is the best TV mirroring app for screencast and video streaming. Using this app, you can mirror your phone's screen to your TV or Roku, and use it as a smart view to watch your favorite shows and movies. This app is free to download. There are no subscription fees, and you can watch as much as you like.  You may effortlessly cast the screen from your phone to the TV if both your phone and TV are connected to the same Wi-Fi network. Moreover, the Roku app allows you to reflect the display of your phone onto a second screen anywhere in the room.