1. Neo4j ：
Neo4j 是最著名的图形数据库管理系统，它也是 Neo4j, Inc. 开发的 NoSQL 数据库系统。它不同于 Mysql 或 MongoDB，因为它具有与其他数据库管理系统相比的特殊功能。 Neo4j 还以图表的形式存储和呈现数据，而不是表格格式或 Jason 格式。在这种情况下，整个数据由节点表示，在那里您可以创建节点之间的关系，这意味着整个数据库集合将看起来像一个图形，这使得 Neo4j 与其他数据库管理系统不同。
2. 沙发床：
Couchbase Server 是一个开源的分布式 JSON 文档数据库，针对交互式应用程序进行了增强。它也被称为 Membase。它由 Couchbase, Inc. 开发，最初于 2010 年 8 月发布。它使用 C++、Erlang、C、Go 语言编写，其服务器旨在为我们提供易于扩展的键值或 JSON 文档访问，并且具有高持续的吞吐量和低延迟。
Neo4j 和 Couchbase 的区别：
| S.No. | Neo4j | Couchbase |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by Couchbase, Inc. |
| 2. | It was initially released in 2007. | It was initially released on August 2010. |
| 3. | It is written using Java and Scala language. | It is written using C++, Erlang, C, Go languages . |
| 4. | Neo4j server operating systems are Linux, OS X, Solaris, and Windows. | Its server operating systems are Linux, OS X, and Windows. |
| 5. | It has foreign keys. | It does not have foreign keys. |
| 6. | Neo4j APIs and other access methods includes Bolt protocol, Cypher query language, Java API, Neo4j-OGM, RESTful HTTP, API, Spring Data Neo4j, TinkerPop 3. | APIs and other access methods include Native language bindings for CRUD, Query, Search and Analytics APIs. |
| 7. | It is data schema free and schema optional. | It is data schema free. |
| 8. | It does not support SQL. | It provides support to Declarative query language (N1QL) that extends ANSI SQL to JSON. |
| 9. | Its primary database model is is Graph DBMS. | Its primary database model is Document Store. |
| 10. | Neo4j supports programming languages which are .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. | It supports .NetC, Clojure, ColdFusion, Erlang, Go, Java, JavaScript, Perl, PHP, Python, Ruby, Scala, Tcl programming languages. |
| 11. | It does not supports Partitioning methods. | It supports Sharding Partitioning methods. |
| 12. | Neo4j is uesd by famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc. | Famous companies like Oxylabs, Kaidee, Immowelt AG, Trendyol Group, etc uses Couchbase. |