Got the Shakes
Member
Yes, something like Feedly (which I use) is the key for what you want. Since transitioning from Google Reader as the backend, I don't notice any differences from using Reeder for iOS and ReadKit for Mac. Works great!
There are other paid options for cloud syncing, and even Feedly has a paid upgrade but I just use the free version of it.
So what I'd be looking to do is setup ReadKit on my Mac and Reeder 2 on iOS (I know people say Mr. Reader is better, but it's not universal). Would a free Feedly account sync what I've read between the two apps, or would I need to pay to upgrade my account so I could have everything sync between my devices?