ObjectBox

ObjectBox empowers fast and reliable data storage and syncing on the edge as well as to the cloud with an edge database and synchronization solution for IoT and Mobile that is super easy to use. With ObjectBox, developers enable devices to operate reliably offline and in real time. When data needs to be sent to the cloud/other devices, ObjectBox Sync ensures that data is synchronized and up to date across instances.

https://objectbox.io/sync/

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