# Apache Solr vs OpenSearch

**Leader by Vioscale score:** OpenSearch

| Attribute | Apache Solr | OpenSearch |
|---|---|---|
| **Vioscale score** | 53.6 (40% (low)) | 60.6 (50% (medium)) |
| activity.commits_last_30d | 100 | 85 |
| adoption.dependent_repos | 0 | 223 |
| adoption.github_stars | 1,667 | 13,581 |
| deployment.options | `{"self_hosted":true}` | `{"on_prem":true,"self_hosted":true}` |
| description.long | Apache Solr is a server-based search platform built on Apache Lucene, enabling full-text, vector, and geospatial search through HTTP REST APIs. It supports distributed indexing, fault-tolerant replication, and near real-time query processing with multi-tenant support. | An open-source search and observability suite that enables enterprises to search, analyze, and monitor unstructured data. It combines full-text search, machine learning, real-time log analysis, and security analytics capabilities in an integrated platform. |
| features.capabilities | `{"faceting":"yes","query_dsl":"HTTP REST API with JSON/XML/CSV","deployment":"self_hosted","geo_search":true,"distributed":"clustered","index_engine":"lucene","licence_class":"permissive_oss","multi_tenancy":true,"vector_search":"hybrid_fusion","realtime_indexing":"near_real_time"}` | `{"deployment":"self_hosted","geo_search":false,"distributed":"sharded","licence_class":"source_available","log_analytics":true,"multi_tenancy":true,"vector_search":"hybrid_fusion","relevance_tuning":"bm25_only","realtime_indexing":"near_real_time"}` |
| integrations.count | 10 | 1 |
| integrations.list | `[{"name":"Apache Lucene"},{"name":"Apache Zookeeper"},{"name":"Apache Tika"},{"name":"Docker"},{"name":"Kubernetes"},{"name":"Apache ManifoldCF"},{"name":"Apache Spark"},{"name":"Apache Nutch"},{"name":"Apache Zeppelin"},{"name":"Apache OpenNLP"}]` | `[{"name":"Data Prepper"}]` |
| language.primary | Java | Java |
| license.spdx | Apache-2.0 | Apache-2.0 |
| platform.support | `{"cli":true,"linux":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://solr.apache.org","retrievedAt":"2026-08-14T21:34:00.435Z"}` | `{"type":"open_source","summary":"Open source and free to use","freeTier":true,"sourceUrl":"https://opensearch.org","retrievedAt":"2026-08-14T16:38:44.075Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | commercial |
| pricing.price_level | free | free |
| pricing.transparent | yes | yes |
| release.cadence_days | - | 29 |
| release.history | - | `[{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.8.0","date":"2026-08-05T17:20:33Z","type":"stable","version":"3.8.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.6","date":"2026-07-06T18:22:45Z","type":"stable","version":"2.19.6"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.7.0","date":"2026-06-09T23:41:20Z","type":"stable","version":"3.7.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.6.0","date":"2026-04-07T22:06:23Z","type":"stable","version":"3.6.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.5","date":"2026-05-13T17:52:18Z","type":"stable","version":"2.19.5"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.5.0","date":"2026-02-12T15:40:44Z","type":"stable","version":"3.5.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.4.0","date":"2025-12-17T07:57:13Z","type":"stable","version":"3.4.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.4","date":"2025-11-06T21:45:44Z","type":"stable","version":"2.19.4"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.3.2","date":"2025-10-30T20:34:44Z","type":"stable","version":"3.3.2"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.3.1","date":"2025-10-22T18:32:00Z","type":"stable","version":"3.3.1"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.3.0","date":"2025-10-14T21:22:10Z","type":"stable","version":"3.3.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.2.0","date":"2025-08-19T23:45:42Z","type":"stable","version":"3.2.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.3","date":"2025-08-21T21:09:15Z","type":"stable","version":"2.19.3"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.1.0","date":"2025-06-24T22:18:26Z","type":"stable","version":"3.1.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.0.0","date":"2025-05-06T21:58:50Z","type":"stable","version":"3.0.0"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.0.0-beta1","date":"2025-04-23T00:16:18Z","type":"stable","version":"3.0.0-beta1"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.2","date":"2025-08-21T21:11:35Z","type":"stable","version":"2.19.2"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/3.0.0-alpha1","date":"2025-03-18T22:31:54Z","type":"stable","version":"3.0.0-alpha1"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/2.19.1","date":"2025-02-27T23:31:01Z","type":"stable","version":"2.19.1"},{"url":"https://github.com/opensearch-project/OpenSearch/releases/tag/1.3.20","date":"2024-12-11T23:23:59Z","type":"stable","version":"1.3.20"}]` |
| security.disclosure_policy | yes | yes |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=helm&package_name=apache-solr%2Fsolr&per_page=100","last_12m":0,"max_severity":null}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.opensearch.client%3Aopensearch-rest-high-level-client&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Search Engines)

| Capability | Apache Solr | OpenSearch |
|---|:--:|:--:|
| **Deployment** |  |  |
| Deployment | Self-hosted | Self-hosted |
| **Architecture** |  |  |
| Index engine | Lucene | - |
| **Query** |  |  |
| Query DSL (JSON / SQL / params / GraphQL) | HTTP REST API with JSON/XML/CSV | - |
| Faceting & filtering | Yes | - |
| Geo search | ✓ | ✗ |
| **Relevance** |  |  |
| Typo tolerance / fuzzy | - | - |
| Relevance tuning | - | BM25 only |
| **Vector** |  |  |
| Vector / hybrid search | Dense + lexical fusion | Dense + lexical fusion |
| **Scale** |  |  |
| Distributed / horizontal scale | Clustered | Sharded |
| Multi-tenancy (indexes / collections / tenants) | ✓ | ✓ |
| **Ingest** |  |  |
| Real-time indexing | Near-real-time | Near-real-time |
| **Workload** |  |  |
| Log / analytics workload | - | ✓ |
| **Licensing** |  |  |
| Licence class | Permissive OSS | Source-available (SSPL / Elastic) |

*Source: Vioscale. Generated 2026-09-01T17:23:47.436Z. "-" = undocumented, not absent.*