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Comment by RubenSandwich | Hacker News Reader

Small nit pick. Realm does not use the "underlying SQLite database" as listed here: http://www.reactnativeexpress.com/persistence. Realm is built from scratch as an append only database, see here: https://realm.io/products/realm-mobile-database/ and here: https://github.com/realm/realm-core.

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How would you compare Realm vs Couchbase Mobile in terms of a syncing mobile store?

Maybe a more fair comparison is to IBM's CloudantSync[0] which is the managed service version of Couchbase compliant Cloudant.

[0] https://developer.ibm.com/clouddataservices/offline-first/

I honestly haven't tried Couchbase mobile or CloudantSync. I got a few questions about Couchbase when I was teaching my last class on RN, and I've been meaning to try it. It sounds powerful and popular.

Hod @ Couchbase. Couchbase Mobile has had sync for a long time. It's used in serious, large scale deployments. (Check out the video from Ryan Air if you want to see a really cool example of how they were able to improve their app with it.) Couchbase is a document oriented database storing JSON and blobs. (I'm not a Realm expert, so I won't attempt to compare sync solutions.)

(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.

Ah, thanks. I will change. I was going off my own memory from talking to a few Realm guys months ago, but clearly I should've just rtfm :)

No worries. Just glad to help, thanks for putting this tutorial together. :)

Fixed! Man, deploying while on HN is scary.

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