4K Streaming App?

I am looking for apps that provide 4k links. It MUST have 4k! Right now I use Kodi, Syncler and CinemaHD.

Kodi is hard for the wife to use. CinemaHD works but will eventually go away. Syncler is the best one for us but it's paid and we are just looking for alternatives.

Other than those 3 apps I cannot find any that provide 4k links even with real-debrid. Any other suggestions??