[makeramen]

As someone who has been playing around with Parse and Firebase SDKs (on Android), this seems to be the first one that offers full 2-way sync. I haven't actually used it yet but it seems that way due to the presence of conflict resolution [1]. I'm personally really excited about that for mobile side-projects and MVPs.

Parse has an offline cache, that only caches query results and not actual objects. So any local saves/updates are not reflected until you get network access again, unless you manually implement your own cache.

Firebase is better at handling realtime changes, but is lacking in any realtime capabilities at the moment. Also Firebase's mobile authentication SDK still isn't released yet so no way to handle users yet either.

[1]: https://www.dropbox.com/developers/datastore/tutorial/androi...

[pavpanchekha]

Yeah, the Datastores API does two-way synchronization. Also, offline caches are done for you and offline changes are propagated (with conflict resolution) when the internet comes back up.

[makeramen]

Correction: "lacking in any realtime capabilities" should read "offline capabilities". And by that I mean offline without manually managing cache.

Also by 2-way sync I mean 2-way cache sync. Firebase is actually really good with 2-way sync, but without cache/offline (yet) it's kind of a dealbreaker for me.