# Hazelcast vs RocksDB

| Attribute | Hazelcast | RocksDB |
|---|---|---|
| **vioscaleAI score** | 60.7 (56% (medium)) | 60.1 (47% (low)) |
| activity.commits_last_30d | 80 | 80 |
| adoption.dependent_repos | 10,433 | 2,684 |
| adoption.github_stars | 6,620 | 32,198 |
| adoption.package_downloads_weekly | 3,112 | 589 |
| content.faq | `[{"answer":"Hazelcast is a distributed data platform that provides real-time processing and continuous intelligence capabilities. It supports clustering and integrates with various frameworks and clients. It is indexed under Key-Value Stores.","source":"https://hazelcast.com","question":"What is Hazelcast?","confidence":0.6},{"answer":"Hazelcast supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://hazelcast.com","question":"What platforms does Hazelcast support?","confidence":0.6},{"answer":"Yes. Hazelcast can be deployed cloud / SaaS, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://hazelcast.com","question":"Can Hazelcast be self-hosted?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Hazelcast. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Hazelcast not holding them. Always confirm compliance directly before you rely on it.","source":"https://hazelcast.com/blog/health-information-privacy/","question":"What security certifications does Hazelcast have?","confidence":0.7},{"answer":"Yes. Hazelcast is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://www.npmjs.com/package/hazelcast-client","question":"Is Hazelcast open source?","confidence":0.85}]` | `[{"answer":"An embeddable C++ database library optimized for high-performance storage and retrieval on flash drives and RAM, supporting workloads from application caching to multi-terabyte data storage with configurable write and read performance tradeoffs. It is indexed under Key-Value Stores.","source":"https://rocksdb.org","question":"What is RocksDB?","confidence":0.6},{"answer":"RocksDB is open source, so it can be self-hosted and used at no licence cost. It is released under the GPL-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://rocksdb.org","question":"Is RocksDB free to use?","confidence":0.6},{"answer":"RocksDB supports Linux. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://rocksdb.org","question":"What platforms does RocksDB support?","confidence":0.6},{"answer":"Yes. RocksDB can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://rocksdb.org","question":"Can RocksDB be self-hosted?","confidence":0.6},{"answer":"Yes. RocksDB is published under the GPL-2.0 licence, a copyleft licence, so check its terms before embedding it in a closed-source product. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/facebook/rocksdb","question":"Is RocksDB open source?","confidence":0.67}]` |
| deployment.options | `{"cloud":true,"hybrid":true,"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A distributed, in-memory computing platform that combines caching, stream processing, and data integration to enable real-time applications with low-latency data access and instant decision-making. | RocksDB is a library for integrating database functionality into applications, designed to persist large volumes of data with careful attention to balancing write throughput, read latency, and space efficiency. It supports parallel processing and is optimized for flash storage environments. |
| features.capabilities | `{"clustering":"replicated","deployment":"self_hosted","autoscaling":true,"consistency":"strong","open_source":true,"persistence":"durable","eviction_ttl":true,"storage_tier":"in_memory","latency_class":"sub-second","pricing_model":"open-source-self-host","streaming_sql":true,"wire_protocol":"custom","pubsub_streams":true,"data_structures":"kv_only","deployment_model":"self-hosted","delivery_guarantee":"exactly-once","stateful_processing":true}` | `{"clustering":"single_node","deployment":"embedded","consistency":"strong","persistence":"append_log","eviction_ttl":true,"storage_tier":"persistent","licence_class":"copyleft","multi_threaded":true,"data_structures":"kv_only"}` |
| integrations.count | 6 | - |
| integrations.list | `[{"name":"Spring Integration"},{"name":"MongoDB"},{"name":"Kafka","native":true},{"name":"Hadoop","native":true},{"name":"S3","native":true},{"name":"RDBMS","native":true},{"name":"JMS","native":true},{"name":"Oracle Database","native":true,"category":"database","direction":"bidirectional"},{"name":"Microsoft SQL Server","native":true,"category":"database","direction":"bidirectional"},{"name":"JDBC","native":true,"category":"database","direction":"bidirectional"}]` | - |
| language.primary | Java | C++ |
| license.spdx | Apache-2.0 | GPL-2.0 |
| platform.support | `{"cli":true,"linux":true}` | `{"linux":true}` |
| pricing | `{"type":"quote","sourceUrl":"https://hazelcast.com","retrievedAt":"2026-08-03T21:11:26.502Z"}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://rocksdb.org","retrievedAt":"2026-08-14T21:39:20.137Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | unknown | free |
| pricing.transparent | no | - |
| release.cadence_days | 15 | 21 |
| release.history | `[{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0","date":"2026-05-13T10:46:12Z","type":"stable","version":"v5.7.0"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.6.0","date":"2025-10-15T14:47:06Z","type":"stable","version":"v5.6.0"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.5.0","date":"2024-07-26T17:03:03Z","type":"stable","version":"v5.5.0"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.8","date":"2024-07-17T14:13:54Z","type":"stable","version":"v5.3.8"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.4.0","date":"2024-04-15T17:55:57Z","type":"stable","version":"v5.4.0"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.7","date":"2024-04-03T10:23:29Z","type":"stable","version":"v5.3.7"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.2.5","date":"2024-02-26T14:47:57Z","type":"stable","version":"v5.2.5"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.6","date":"2023-11-09T14:00:06Z","type":"stable","version":"v5.3.6"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.5","date":"2023-10-24T14:59:38Z","type":"stable","version":"v5.3.5"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.2","date":"2023-08-21T15:41:18Z","type":"stable","version":"v5.3.2"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.0.5","date":"2023-06-28T13:47:26Z","type":"stable","version":"v5.0.5"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.1.7","date":"2023-06-19T14:02:07Z","type":"stable","version":"v5.1.7"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.2.4","date":"2023-06-13T12:40:26Z","type":"stable","version":"v5.2.4"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.1","date":"2023-06-09T09:24:01Z","type":"stable","version":"v5.3.1"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v4.2.8","date":"2023-05-29T09:56:41Z","type":"stable","version":"v4.2.8"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.0","date":"2023-05-19T06:32:29Z","type":"stable","version":"v5.3.0"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.1.6","date":"2023-05-10T10:55:54Z","type":"stable","version":"v5.1.6"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.0-BETA-2","date":"2023-04-12T10:58:26Z","type":"stable","version":"v5.3.0-BETA-2"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.2.3","date":"2023-03-23T13:28:16Z","type":"stable","version":"v5.2.3"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.3.0-BETA-1","date":"2023-03-17T06:49:49Z","type":"stable","version":"v5.3.0-BETA-1"}]` | `[{"url":"https://github.com/facebook/rocksdb/releases/tag/v11.8.1","date":"2026-08-07T17:30:50Z","type":"stable","version":"v11.8.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v11.1.2","date":"2026-06-25T01:05:56Z","type":"stable","version":"v11.1.2"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v11.1.1","date":"2026-04-29T21:42:29Z","type":"stable","version":"v11.1.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v11.0.4","date":"2026-04-07T22:14:36Z","type":"stable","version":"v11.0.4"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.10.1","date":"2026-02-02T19:07:20Z","type":"stable","version":"v10.10.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v8.11.5","date":"2026-01-21T17:25:14Z","type":"stable","version":"v8.11.5"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.9.1","date":"2026-01-06T03:41:23Z","type":"stable","version":"v10.9.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.8.3","date":"2026-01-06T03:36:05Z","type":"stable","version":"v10.8.3"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.7.5","date":"2025-10-22T21:41:35Z","type":"stable","version":"v10.7.5"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.6.2","date":"2025-10-22T17:48:16Z","type":"stable","version":"v10.6.2"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.5.1","date":"2025-08-11T15:38:38Z","type":"stable","version":"v10.5.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.4.2","date":"2025-07-11T00:32:43Z","type":"stable","version":"v10.4.2"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.2.1","date":"2025-04-29T21:06:48Z","type":"stable","version":"v10.2.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.1.3","date":"2025-04-14T20:50:23Z","type":"stable","version":"v10.1.3"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v9.11.2","date":"2025-03-29T21:45:52Z","type":"stable","version":"v9.11.2"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v10.0.1","date":"2025-03-31T18:29:41Z","type":"stable","version":"v10.0.1"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v9.10.0","date":"2025-01-02T18:31:00Z","type":"stable","version":"v9.10.0"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v9.9.3","date":"2024-12-17T18:06:55Z","type":"stable","version":"v9.9.3"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v9.8.4","date":"2024-12-03T21:25:53Z","type":"stable","version":"v9.8.4"},{"url":"https://github.com/facebook/rocksdb/releases/tag/v9.7.4","date":"2024-11-01T16:39:27Z","type":"stable","version":"v9.7.4"}]` |
| reliability.status_page | yes | yes |
| security.gdpr | yes | - |
| security.scorecard | 4.2 | 7.1 |
| security.vulnerabilities | `{"count":10,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.hazelcast%3Ahazelcast&per_page=100","last_12m":2,"max_severity":"CRITICAL"}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.rocksdb%3Arocksdbjni&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Key-Value Stores)

| Capability | Hazelcast | RocksDB |
|---|:--:|:--:|
| **Storage** |  |  |
| Storage tier | In-memory | Persistent |
| Persistence | Fully durable | Append-only log |
| Data structures | KV-only | KV-only |
| **Protocol** |  |  |
| Wire protocol | Custom | - |
| **Distribution** |  |  |
| Clustering | Replicated | Single-node |
| Consistency | Strong | Strong |
| **Ops** |  |  |
| Eviction / TTL policies | ✓ | ✓ |
| Multi-threaded | - | ✓ |
| Pub/Sub / streams | ✓ | - |
| Transactions / atomic ops | - | - |
| **Deployment** |  |  |
| Deployment | Self-hosted | Embedded |
| **Licensing** |  |  |
| Licence class | - | Copyleft |
| **Compatibility** |  |  |
| Redis API compatibility | - | - |

*Source: vioscaleAI. Generated 2026-10-16T19:03:47.547Z. "-" = undocumented, not absent.*