Does using the Roku Xfinity Stream app count against your 1TB data cap?

I recently picked up my first 4K TV, and I have found that I am now using much more data than I ever did before.  Streaming UHD content clearly takes up a lot of bandwidth. I was thinking that the Xfinity Stream app might be a great solution towards the end of the month if I am approaching my 1TB cap. Since the app has been marketed as an alternative to traditional VOD, I assume it will not count against my cap, but I wanted to verify this. Thanks!