Couchbase Mobile is open source. Couchbase only provides the data platform, but is significantly more sophisticated at it than Firebase. Firebase offers many other services, so you can't really make a direct comparison. In simple terms, the way I think of it, Firebase goes wide, offering a package with many elements, while Couchbase goes deep on one area, the data platform. (FYI I work at Couchbase.)

From the article:

>Always heavily consider open source alternatives (something which didn’t exist for Firebase at the time… but now alternatives like Horizon and Backendless exist, for example.

Well https://deepstream.io. is the best option for this.