# Apache Storm vs Hazelcast

**Leader by vioscaleAI score:** Hazelcast

| Attribute | Apache Storm | Hazelcast |
|---|---|---|
| **vioscaleAI score** | 52 (39% (low)) | 60.7 (56% (medium)) |
| activity.commits_last_30d | 55 | 80 |
| adoption.dependent_repos | 1,756 | 10,433 |
| adoption.github_stars | 6,695 | 6,620 |
| adoption.package_downloads_weekly | - | 3,112 |
| content.faq | `[{"answer":"An open-source system designed to handle continuous streams of information quickly and reliably, without stopping, with built-in protections against data loss. It is indexed under Streaming Analytics.","source":"https://storm.apache.org","question":"What is Apache Storm?","confidence":0.6},{"answer":"Apache Storm is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://storm.apache.org","question":"Is Apache Storm free to use?","confidence":0.6},{"answer":"Apache Storm supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://storm.apache.org","question":"What platforms does Apache Storm support?","confidence":0.6},{"answer":"Yes. Apache Storm can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://storm.apache.org","question":"Can Apache Storm be self-hosted?","confidence":0.6},{"answer":"Yes. Apache Storm 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://github.com/apache/storm","question":"Is Apache Storm open source?","confidence":0.95},{"answer":"Apache Storm is available worldwide. The vendor is headquartered in the United States.","source":"https://storm.apache.org","question":"Where is Apache Storm available?","confidence":0.75}]` | `[{"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}]` |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true,"hybrid":true,"self_hosted":true}` |
| description.long | A free and open-source framework that reliably processes continuous streams of data across distributed systems with guaranteed delivery and fault tolerance. | 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. |
| features.capabilities | `{"open_source":true,"pricing_model":"open-source-self-host","deployment_model":"self-hosted"}` | `{"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}` |
| integrations.count | 2 | 6 |
| integrations.list | `[{"name":"Hadoop"},{"name":"Kafka"}]` | `[{"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 | Java |
| license.spdx | Apache-2.0 | Apache-2.0 |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true}` | `{"cli":true,"linux":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://storm.apache.org","retrievedAt":"2026-10-15T20:29:14.052Z"}` | `{"type":"quote","sourceUrl":"https://hazelcast.com","retrievedAt":"2026-08-03T21:11:26.502Z"}` |
| pricing.free_tier | yes | - |
| pricing.model | open_source | commercial |
| pricing.price_level | free | unknown |
| pricing.transparent | yes | no |
| release.cadence_days | 29 | 15 |
| release.history | `[{"url":"https://github.com/apache/storm/releases/tag/v3.1.0","date":"2026-09-12T23:01:46Z","type":"stable","version":"v3.1.0"},{"url":"https://github.com/apache/storm/releases/tag/v3.0.0","date":"2026-07-22T22:27:16Z","type":"stable","version":"v3.0.0"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.9","date":"2026-07-22T22:24:51Z","type":"stable","version":"v2.8.9"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.8","date":"2026-05-18T22:03:07Z","type":"stable","version":"v2.8.8"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.7","date":"2026-04-19T17:26:04Z","type":"stable","version":"v2.8.7"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.6","date":"2026-04-07T18:11:58Z","type":"stable","version":"v2.8.6"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.5","date":"2026-03-25T00:05:25Z","type":"stable","version":"v2.8.5"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.4","date":"2026-03-02T15:29:20Z","type":"stable","version":"v2.8.4"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.3","date":"2025-11-02T17:42:34Z","type":"stable","version":"v2.8.3"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.2","date":"2025-08-03T20:48:08Z","type":"stable","version":"v2.8.2"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.1","date":"2025-06-03T00:05:21Z","type":"stable","version":"v2.8.1"},{"url":"https://github.com/apache/storm/releases/tag/v2.8.0","date":"2025-01-24T12:36:59Z","type":"stable","version":"v2.8.0"},{"url":"https://github.com/apache/storm/releases/tag/v2.7.1","date":"2025-01-09T14:24:47Z","type":"stable","version":"v2.7.1"},{"url":"https://github.com/apache/storm/releases/tag/v2.7.0","date":"2025-01-09T14:24:29Z","type":"stable","version":"v2.7.0"}]` | `[{"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"}]` |
| reliability.status_page | - | yes |
| security.gdpr | - | yes |
| security.scorecard | 6 | 4.2 |
| security.trust_center | https://storm.apache.org/security-model.html | - |
| security.vulnerabilities | `{"count":6,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.apache.storm%3Astorm-core&per_page=100","last_12m":0,"max_severity":"HIGH"}` | `{"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"}` |

## Capabilities (Streaming Analytics)

| Capability | Apache Storm | Hazelcast |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Processing model | - | - |
| Delivery guarantee | - | Exactly once |
| Streaming sql | - | ✓ |
| Event time watermarks | - | - |
| Stateful processing | - | ✓ |
| Cdc support | - | - |
| Deployment model | Self hosted | Self hosted |
| Autoscaling | - | ✓ |
| Connector breadth | - | - |
| Latency class | - | Sub second |
| Open source | ✓ | ✓ |
| SOC2 | - | - |
| Pricing model | Open source self host | Open source self host |

*Source: vioscaleAI. Generated 2026-10-16T20:08:49.209Z. "-" = undocumented, not absent.*