Hazelcast is an open source in-memory data grid based on Java. Developed by Hazelcast, Inc.
License: Open Source
Hazelcast is primarily an in-memory data grid that excels in real-time data processing and distributed computing, while CouchBase is a NoSQL document database known for its flexible data model and powerful querying capabilities. CouchBase offers more traditional database features such as built-in caching and backup, making it suitable for a wider range of applications, including mobile and IoT.