Sling TV debuts free streaming option on Roku Sling TV is trying a new way to reach potential users with a free option of its streaming platform. Through a "browse as guest" option, newcomers to Sling will be able to check out episodes from some shows (including Billions, Shameless and Ray Donovan) at no cost, though it seems only one episode is available for each of those series. You can also subscribe to standalone channels, such as Showtime, without having to pony up for a Sling package. Sling is rolling the feature out on Roku starting today, and plans to bring it to more devices in the future.Sling TV debuts free streaming option on Roku