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Hazelcast vs Oracle Coherence

Hazelcast: A Java in-memory data grid and stream processor that embeds in your app or runs as a cluster. Oracle Coherence: Oracle's long-running Java data grid, with a UPL-licensed Community Edition on GitHub.

key differences

  • Only Hazelcast has joins, change data capture, compression.
  • Only Oracle Coherence has full-text search, role-based access.

choose hazelcast for

  • +Shared low-latency state for microservices
  • +Fraud detection and payment stream processing
  • +Web session clustering for Java app servers
  • +Distributed caching in front of RDBMS

best at · Cache, Sessions, Streaming

choose oracle-coherence for

  • +Session and state replication for WebLogic and Java apps
  • +Low-latency reference data caches in trading systems
  • +Event-driven processing with map listeners

best at · Cache, Sessions, Real-time analytics

HazelcastA Java in-memory data grid and stream processor that embeds in your app or runs as a cluster.
Oracle CoherenceOracle's long-running Java data grid, with a UPL-licensed Community Edition on GitHub.
overview
Primary model
Key-Value
Key-Value
Also supports
Document, Vector
Document, Vector
Type
Database engine
Database engine
Status
Active
Active
Developer
Hazelcast, Inc.
Oracle
First release
2008
2001
Latest version
5.7.0 (May 12, 2026)
CE 26.07 (Sep 15, 2026)
License
Open source (permissive)Apache 2.0 (Community); Hazelcast Community License for some modules
Open source (permissive)Universal Permissive License 1.0 (Community Edition)
Free tier
✓
✓
popularity
WhichDB Score
33.5
15.7
Rank
#63
#206
GitHub stars
6.6K
474
Stack Overflow questions
2.9K
261
scale & guarantees
Comfortable data size
Medium (≤ 10 TB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Native
Multi-region
Active active
Active active
ACID
Limited
Limited
Consistency
Eventual, Strong
Strong
Schema
Flexible
Schemaless
Architecture
In memory, Distributed, Embedded, Client server
In memory, Distributed, Embedded, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
✓
✓
Edge
—
—
Clouds
AWS, Google Cloud, Azure
Oracle Cloud
capabilities
Transactions
✓
✓
Joins
✓
—
Secondary indexes
✓
✓
Full-text search
—
✓
Vector search
✓
✓
Geospatial
—
—
JSON
✓
✓
Change data capture
✓
—
Triggers
—
—
Stored procedures
✓
✓
Materialized views
—
—
TTL / expiry
✓
✓
Pub/Sub
✓
✓
Columnar storage
—
—
In-memory
✓
✓
Durable persistence
✓
✓
Compression
✓
—
Encryption at rest
—
—
Role-based access
—
✓
Time travel
—
—
Branching
—
—
Online schema changes
—
—
Streaming ingest
✓
✓
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, Predicate API, Jet Pipeline API
CohQL, Filter API, Java Streams
Client languages
Java, C#, C++, Python, JavaScript, Go
Java, C#, C++, JavaScript, Python, Go
Best for
Cache, Sessions, Streaming, Real-time analytics
Cache, Sessions, Real-time analytics, Pub/Sub
Add more to this comparisonNot sure either fits? Try smart match

Hazelcast vs Oracle Coherence: FAQ

What is the difference between Hazelcast and Oracle Coherence?

Hazelcast: A Java in-memory data grid and stream processor that embeds in your app or runs as a cluster. Oracle Coherence: Oracle's long-running Java data grid, with a UPL-licensed Community Edition on GitHub. Only Hazelcast has joins, change data capture, compression. Only Oracle Coherence has full-text search, role-based access.

When should I choose Hazelcast over Oracle Coherence?

Choose Hazelcast for shared low-latency state for microservices; fraud detection and payment stream processing; and web session clustering for Java app servers. Choose Oracle Coherence for session and state replication for WebLogic and Java apps; low-latency reference data caches in trading systems; and event-driven processing with map listeners.

Is Hazelcast or Oracle Coherence more popular?

Hazelcast ranks #63 on the WhichDB Score (33.5/100) and Oracle Coherence ranks #206 (15.7/100). Popularity is not fit: check the requirements that matter for your project.

Are Hazelcast and Oracle Coherence open source?

Yes. Hazelcast is open source. License: Apache 2.0 (Community); Hazelcast Community License for some modules. Yes. Oracle Coherence is open source. License: Universal Permissive License 1.0 (Community Edition).