[joeblau]

Does anyone know of an OSS alternative to this similar to http://helios.io/ that supports Android/iOS?

[jchrisa]

Couchbase Lite is an embedded JSON database with sync capability. It's Apache licensed and available for iOS and Android:

https://github.com/couchbase/couchbase-lite-ios

https://github.com/couchbase/couchbase-lite-android

[joeblau]

Thanks for the link to this library. It seems like I would still need to implement a lot of features like login, but it's a great start.

[jchrisa]

We ship with support for login with Mozilla Persona. Hope to have baked-in support for Facebook Connect soon. Of course you can use it with any auth you want, but you'll end up writing some code...