CouchDB provides another way for managing data within your apps.
The CouchDB NoSQL database engine has been extremely popular for web based apps for some time, and with the TouchDB iOS library you can easily embed a CouchDB compatible database within an iOS app.
CouchCocoa provides a medium level API for working with TouchDB.
You can find the TouchDB library on Github here.
CouchCocoa can be found on Github here.
Be sure to check out the example which provides an app including a CouchDB compatible database, and shows how to sync with a server.