Apache Solr
Apache Solr: A self-hosted search server with broad query, indexing, and distributed deployment capabilities. Ranked #2 of 30 in Search Databases by our editors (9.3/10); pricing: Free plan; best for open-source, full-featured search deployments.
At a glance
- Editor score9.3 / 10
- PricingFree plan
- Best forOpen-source, full-featured search deployments
- Free planYes
- Paid fromFree
- Vector searchYes
- Founded2006
- Facts checked20 Sep 2026
Where it wins
- Hybrid search combines full-text, faceting, vector, and geospatial queries
- Distributed indexing supports sharding, replication, and fault tolerance
- REST-like APIs, SolrJ, and an administration interface support varied workflows
Where it doesn't
- Self-hosted deployment places setup and operations with the organization
- Its broad feature set may exceed the needs of simple search projects
- Distributed operation requires configuring sharding, replication, and fault tolerance
Our verdict on Apache Solr
Apache Solr is an open-source search server built on Apache Lucene for developers and organizations creating search, discovery, analytics, and content-navigation systems. It indexes structured and unstructured content and retrieves it through HTTP interfaces. The platform runs on Windows, macOS, and Linux, and supports standalone deployment or SolrCloud mode for distributed operation. Its search modes cover full-text queries, faceted filtering, dense vector and approximate-nearest-neighbor search, and geospatial querying.
The strongest fit is for teams that need a broad search layer rather than a narrow text-search component. Configurable query parsers and text analysis support full-text retrieval, while faceting and filtering work across indexed fields. Dense vector search adds a hybrid search path, and geospatial queries support location-aware results. REST-like APIs accept JSON, XML, CSV, and binary formats, while SolrJ provides a Java client API alongside other client integrations. Built-in administration and metrics give the deployment an operational interface, although the self-hosted model keeps infrastructure responsibility with the organization.
For larger or distributed search workloads, Solr provides sharding, replication, and fault tolerance in addition to distributed indexing. These capabilities can support clustered deployments, but they also make architecture and configuration more involved than a basic single-server search setup. Apache Solr was founded in 2006, providing a long-established project history. Choose it when open-source control, self-hosting, hybrid search, faceting, geospatial queries, and distributed indexing all matter. A simpler hosted or narrowly focused search option may suit teams that want less deployment and operational responsibility.
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Apache Solr pricing
Apache Solr fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Primary search mode | Hybrid |
| Vector search | Yes |
| Faceted search | Yes |
| Deployment | Self-hosted |
| Index limit | Not verified |
| Query interface | REST |
| Deployment | Self-hosted |
| Platforms | Windows, macOS, Linux |
| Support | Email, Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | solr.apache.org |
| Facts checked | 20 Sep 2026 |
Alternatives to Apache Solr
- Manticore SearchA broad, free search database for teams that want SQL and self-hosted control.9.4
- ElasticsearchA broad hybrid search engine for teams that need scale, analytics, and vector retrieval.9.2
- AlgoliaA cloud search platform combining hybrid search, relevance controls, and discovery tools.9.1
See all Apache Solr alternatives →
Apache Solr vs the competition
- Apache Solr vs Manticore Search
- Apache Solr vs Elasticsearch
- Apache Solr vs Algolia
- Apache Solr vs Meilisearch
- Apache Solr vs Typesense
- Apache Solr vs Datafari
Compare Apache Solr with any tool side by side →
Also Ranked In
Apache Solr is ranked in 4 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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