https://www.cnet.com/reviews/roku-streaming-stick-
Post# of 96879
4K HDR video on Roku is currently available from Netflix, YouTube, Amazon Vudu and FandangoNow. Apps with 4K (but not HDR) support include Plex, UltraFlix, Toon Goggles, 4K Universe and Smithsonian, as well as a few other niche apps. No other platform can match that selection.
Streaming in 4K requires more bandwidth, and in the case of Netflix, a more expensive plan. Amazon recommends 15Mbps is ample for 4K streaming, while YouTube and Netflix recommend 20.
Why this is relevant
https://www.consumerreports.org/audio-video/p...er-system/