Realtime - Firebase, Meteor, GUN[0], PouchDB. People should NOT consider Kinto, RethinkDB, and Parse as realtime because you have to manually add that functionality yourself.<p>Permissions&#x2F;Auth - Firebase, Parse. The way these two services do permissions is very different than everybody else (correct me if I am wrong). Therefore others are not comparable.<p>Graph - GUN. I think this is an important comparison for people to think about, all the other databases are essentially document stores. Graph data allows you to do key&#x2F;value, relational, document oriented data, as well as have circular references.<p>[0] <a href="http:&#x2F;&#x2F;github.com&#x2F;amark&#x2F;gun" rel="nofollow">http:&#x2F;&#x2F;github.com&#x2F;amark&#x2F;gun</a> Full disclosure: I&#x27;m the author.