(Adam from Realm) Realm is an ACID compliant object database. Compared to Couchbase it is much more performant and memory efficient. In terms of data sync, Real

(Adam from Realm) Realm is an ACID compliant object database. Compared to Couchbase it is much more performant and memory efficient. In terms of data sync, Realm works by transferring the compressed changes from the transaction log (so just the diffs and capturing the semantic intent of the action) and automatically resolving conflicts using operational transformation. This approaches leads to extremely low latency enabling realtime collaboration functionality. This is quite different than Couchbase which is sending the entire object, requiring the developer to manually resolve conflicts.