So far here is every Roku Channel that supports 4K content:
4K Spotlight
Roku Media Player
500px
Flickr
Picasa
iFood.TV
Toon Goggles
Smithsonian Earth
UltraFlix 4K
MGO Premium
Vudu
Plex
Amazon Video
Netflix
Youtube
Here is how Roku describes the new channels:
Toon Goggles
Add the Toon Goggles channel to watch thousands of fun and educational cartoons and live-action shows. Finally, an entertainment destination safe for kids to watch what, when and where they want! With the Toon Goggles – On-Demand Entertainment for Kids channel, anyone can enjoy kid-safe and parent-friendly content. – 6 show categories including boys, girls, action, comedy, preschool, and educational—allowing children to easily find what they love. – Constantly updated with new and unique content from around the world, including full series and feature-length movies! – All content is parent-friendly and reviewed extensively before being released. – Create your own Toon Goggles account at toongoggles.com and link your device! – Jump! to a suggested show at the touch of a button! – Registered users can resume videos! – Registered users can see Recently Watched shows! – Stream HQ video on your TV!
iFood.TV
iFood.tv has over 40,000 trustworthy and practical food videos for all tastes. Enjoy recipes for Holidays, Desserts, Drinks, Appetizers, Entrees, Kids, Healthy, Easy, Vegetarian, Cake, Salad, Pizza, Pasta, Indian, Chinese, Mexican, Italian, Thai, Gourmet and many other foods you will love.
The growth of new 4K services has been fairly slow on all the major 4K streaming boxes but currently Roku offers the most 4K supported services.
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