| 1. | In CouchDB, the records are stored in the DOCUMENTS in the database. | In MongoDB, the records are stored in the collection in the database |
| 2. | Master-Master replication in CouchDB | Master-Slave replication in MongoDB |
| 3. | CouchDB is WRITTEN in Erlang | MongoDB is written in C++ |
| 4. | In CouchDB, the INTERFACE is REST/HTTP | In MongoDB, the interface is TCP/IP Custom Protocol |
| 5. | Slower than MongoDB | Faster than CouchDB |