Does anyone know of an app that checks the following requirements?

1. Has an equivalent Reddit app (I think Boost and Sync are examples of this?)
2. It can remember where you left off even if you close the app. Suppose I'm browsing the top of all time of a particular sub and I want to keep going later just where I left it. Is this something possible with apps or only with mobile browsers?
3. Doesn't have issues playing both videos and gifs.