Google Cloud Save

Google Cloud Save is a service that enables per-user data storage and sync in your apps with no backend programming required. Google Cloud Save stores its data in Google Cloud Datastore, a fully managed, schemaless database for storing non-relational data. Cloud Datastore automatically scales with your users. Google Cloud Save works even when your device is offline, and it provides an easy transition to server-side coding because the same database is accessible via App Engine and Compute Engine. Finally, Google Cloud Save provides a generous initial per-user free quota that expands as your user base grows.