From the results of a query, to a single field of a document, with RxDB you can observe everything. This enables you to build realtime applications fast and reliable. Whenever your data changes, your UI reflects the new state.
RxDB supports replication with a CouchDB server or any custom GraphQL endpoint which smoothly integrates with your existing infrastructure. Also you can use the replication primitives plugin to create custom replications over any protocol like REST, Websocket or p2p.
RxDB follows the Offline First paradigm where an application must work as well offline as it does online. This is done by persisting data on the client side and replicating it in the background. RxDB can even be used solely on the client side, with no backend at all.