UltraFlix, a 4K streaming service, was released on the Roku recently. This brings the total number of 4K-supported Roku channels to 14 and, from our understanding, makes the Roku 4 the set-top box with the most 4K content.
With UltraFlix coming to Roku you can now stream the new Star Trek movies, World War Z, and many other big name movies in 4K.
Here is how NanoTech, the owners of UltraFlix, describe the service:
Offering the world’s largest library of 4K content, UltraFlix is a streaming network that enables subscribers to choose from over 600 hours of pristine 4K ultra-HD video on-demand content in a range of categories plus 100 hours of free content. UltraFlix has also become the preferred 4K STB and Smart TV App for leading 4K Smart TV manufacturers, including Hi-Sense, Samsung, Sony, and Vizio, which are in the process of completing their testing and integration.
You can add UltraFlix to your Roku 4 here: https://channelstore.roku.com/details/47123/ultraflix