Amazon Cognito Sync

Amazon Cognito Sync is an AWS web service and client library that makes it possible for an application-related data to cross-device syncing. Developers do not need to implement a backend to synchronize user profile data across mobile devices and the web. A device's (mobile or web) connectivity status, such as online or offline, doesn't matter, as client libraries cache data locally on the device so that applications can read and write data easily. Once the devices are online, the data synchronization can be done manually or using a push sync, and they will automatically and immediately sync the devices once they are online.