Roku players can only connect to devices with HDMI inputs (and a couple of older models had composite output). Unless you have a tablet or computer with an HDMI
input, there's no way to watch a Roku on them. Very few PCs or tablets (if any) have such inputs. You could add a video capture card to a PC, but I think a new TV would cost less.
Dan
Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.