GeForce NOW for SHIELD provides a Netflix-style game-streaming experience. Members get instant, and unlimited, access to a game library that includes PC games. Premium titles can also be purchased in the GeForce NOW store . New games are added regularly, and all games require a gamepad (included with SHIELD TV) to play. GeForce NOW for SHIELD is priced at $7.99 per month , and your first month of service is free. More information can be found here.
GeForce NOW for Mac and PC provides you with instant, on-demand access to your own virtual GeForce GTX gaming PC in the cloud. You can use this machine to play games you own, or purchase new ones, on popular digital game stores like Steam, Uplay, Origin and Battle.net . The service provides a simple way to enjoy the latest games, with amazing visual quality, on machines that otherwise would not be able to run them. You can purchase 20 hours of on-demand playtime on a GeForce GTX 1060-class PC, or 10 hours of playtime on a GeForce GTX 1080-based PC, for $25 . You will receive 8 hours of free playtime on a GeForce GTX 1060 PC, or 4 hours on a GeForce GTX 1080 PC, when you register for service. More information can be found here.
If you want to use both services, then you will need to register for each separately.
Just wondering what the key differences are between the versions, and if there will ever be parity?
Gamestream gives you an option to stream your entire library. Geforce Now on PC and Mac is essentially that same option. Geforce Now on Shield TV is stringent with limited library. It's shame because one could replace their gaming pc if only they'd revised it on the Shield TV.
I wrote out an entire post then realized this link alone does a better job explaining GeForce now on PC.
http://www.geforce.com/geforce-now
They are different prices as well, and GeForce Now on the Shield is limited to a small library of select games.
Now on the PC looks really cool, I can't wait to get it.