Do you know what this is?

I am trying to find out what UI is being used on a number of channels. It is better than the ROKU basic. It has a picture grid with a description balloon that you navigate up and down or left and right.

Also, channels like Portico are well done but seem to be completely custom.

I would like to use this but can't find what it's called. If you know please help and thanks.

Rokon