What is Apache Solr?
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.
Apache Solr pricing
We don't have Apache Solr's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Apache Solr does
The capabilities that matter for search engines, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Deployment
- Self-hosted
- Index engine
- Lucene
- Query DSL (JSON / SQL / params / GraphQL)
- HTTP REST API with JSON/XML/CSV
- Faceting & filtering
- Yes
- Geo search
- ✓
- Typo tolerance / fuzzy
- -
- Relevance tuning
- -
- Vector / hybrid search
- Dense + lexical fusion
- Distributed / horizontal scale
- Clustered
- Multi-tenancy (indexes / collections / tenants)
- ✓
- Real-time indexing
- Near-real-time
- Log / analytics workload
- -
- Licence class
- Permissive OSS
Platform & deployment
Independently observed- CLI
- Linux
- Self-hosted
Integrations (10)
Independently observed- Apache Lucene
- Apache Zookeeper
- Apache Tika
- Docker
- Kubernetes
- Apache ManifoldCF
- Apache Spark
- Apache Nutch
- Apache Zeppelin
- Apache OpenNLP
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Apache Solr FAQ
Common questions about Apache Solr, answered from independent, dated evidence.
What is Apache Solr?
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. It is indexed under Search Engines.
Source: https://solr.apache.org
Is Apache Solr free to use?
Apache Solr 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://solr.apache.org
What platforms does Apache Solr support?
Apache Solr supports Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://solr.apache.org
Can Apache Solr be self-hosted?
Yes. Apache Solr can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://solr.apache.org
What does Apache Solr integrate with?
We have confirmed 10 integrations for Apache Solr, including Apache Lucene, Apache Zookeeper, Apache Tika, Docker, Kubernetes, Apache ManifoldCF, Apache Spark and Apache Nutch, plus 2 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://solr.apache.org
Is Apache Solr open source?
Yes. Apache Solr 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/solr
Apache Solr alternatives
Other search engines we track, ranked by the same independent score.
- AlgoliaAI-powered platform for search, retrieval, and discovery experiencesmedium · 74%
- Elasticsearchmedium · 50%
- MeilisearchFast, easy-to-integrate search engine for websites and applicationsmedium · 67%
- VespaA distributed search and inference engine for AI applications at scalehigh · 77%
- CoveoA search engine designed to integrate with Sitecore, providing relevance-tuned results, recommendations, and AI-powered personalizationmedium · 61%
- OpenSearchOpen source search and analytics platform for data ingestion and explorationlow · 47%
Compare Apache Solr
Side by side against other search engines, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Apache Solr, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 63 | 0.14 | 8.5 | ✓ |
| Capabilities | 46 | 0.08 | 3.7 | ✓ |
| Stars | 61 | 0.05 | 2.9 | ✓ |
| Integrations | 30 | 0.05 | 1.6 | ✓ |
| Dependent projects | 0 | 0.05 | 0.0 | ✓ |
| Release cadence | 0 | 0.08 | 0.0 | - |
| Security posture | 5 | 0.12 | 0.0 | - |
| Package downloads | 0 | 0.04 | 0.0 | - |
| Security score | 0 | 0.05 | 0.0 | - |
| Developer Q&A activity | 0 | 0.14 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 100 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 6 items | mediumsource · 2026-09-10 · 66% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Faceting: yes · Query dsl: HTTP REST API with JSON/XML/CSV · Deployment: self_hosted · Geo search: Yes · Distributed: clustered · Index engine: lucene | mediumsource · 2026-08-14 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 10 | mediumsource · 2026-08-13 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Java | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-09-10 · 95% |
Pricing
Security
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