问题
The only thing I understand so far is that Cloudant provides cloud support and uses CouchDB in the backend.
回答1:
Cloudant vs CouchDB 1.6
- Cloudant is horizontally scalable (with respect to data size), CouchDB isn't
- Cloudant offers full text search, CouchDB doesn't
- Cloudant has a different authentication system
- Cloudant has Cloudant query which allows you do declaratively set indices and query the DB. With CouchDB, you have to use views.
Cloudant vs CouchDB 2.0
- Cloudant offers full text search, CouchDB doesn't (though you can get it if you're willing to do a custom compilation)
- Cloudant has a different authentication system
Apart from these differences, there's the obvious one where with Cloudant you don't have to worry about provisioning and managing the servers, in exchange for a payment.
As to how Cloudant is related to CouchDB, CouchDB is obviously core to Cloudant's offerings. However, Cloudant has also contributed a lot of code to CouchDB resulting in some key features in 2.0 (horizontal scalability, query). Quite a few Cloudant employees are also on the CouchDB PMC.
来源：https://stackoverflow.com/questions/38972019/how-is-cloudant-different-from-and-related-to-couchdb