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Apache Solr

solr.apache.org

Free plan Open source WebWindowsmacOSLinuxAPISelf-hosted
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Spec score 9.1 #1 of 20 in Enterprise Search Software

What it is

Apache Solr is a free, open-source, self-hosted search platform built on Apache Lucene. It provides full-text, vector, geospatial, and hybrid search through a REST query interface. Documents can be sent over HTTP as JSON, XML, CSV, or binary, with results returned in those formats. Matching supports phrases, wildcards, joins, and grouping; discovery tools include faceting, autocomplete, spelling suggestions, hit highlighting, and result clustering. Solr distributes indexing, replicates data, balances queries, and supports automated failover and recovery. Apache Tika integration extracts rich content such as PDF and Microsoft Word files. Its administrative interface controls instances and exposes cluster state, logs, threads, and metrics. Listed security capabilities include SSL, authentication, and role-based authorization. Solr runs on Linux, macOS, and Windows, with API access, and is licensed under Apache License, Version 2.0. The project describes use from weekend projects to global enterprises. Releases are not scheduled in advance, and versions below 9.10 are end of life without further updates. The Apache Solr plan is free.

Spec sheet

What it does
Apache Solr is a Java search server for full-text, vector, geospatial, analytics and distributed indexing workloads.Read 15 Oct 2026 · solr.apache.org
Intended users
The project describes Solr as suitable for global enterprises and weekend projects, and says it powers heavily trafficked websites and applications.Read 4 Oct 2026 · solr.apache.org
License
Solr is released under the permissive Apache License 2.0.Read 15 Oct 2026 · solr.apache.org
Founded
2006Read 23 Sep 2026 · solr.apache.org
Administration
A responsive web administration interface and JMX metrics are supplied.Read 15 Oct 2026 · solr.apache.org
Community support
The Solr community provides free user support through its users mailing list and other listed channels.Read 4 Oct 2026 · solr.apache.org
Current release
Solr 10.0.0 is listed as the current stable major release, with 9.10.x receiving limited critical fixes.Read 15 Oct 2026 · solr.apache.org
Data formats
Documents can be indexed through HTTP as JSON, XML, CSV or binary, with results returned in those formats.Read 15 Oct 2026 · solr.apache.org
Deployment integrations
Official documentation covers Docker deployment and the project website links Kubernetes integration resources.Read 15 Oct 2026 · solr.apache.org
Discovery features
Solr supports faceting, autocomplete, spelling suggestions, hit highlighting, and search results clustering.Read 4 Oct 2026 · solr.apache.org
Discovery tools
Autocomplete, spell suggestions, result clustering and configurable hit highlighting are included.Read 15 Oct 2026 · solr.apache.org
Distributed scale
Solr provides distributed indexing, replication, load-balanced querying, automated failover, and recovery.Read 4 Oct 2026 · solr.apache.org
Documentation
The official reference guide covers concepts, deployment, configuration, indexing, querying and upgrades, and is written by Solr committers.Read 15 Oct 2026 · solr.apache.org
Downloads and support limits
Solr releases are not scheduled in advance; older versions below 9.10 are end of life and will not receive further updates.Read 4 Oct 2026 · solr.apache.org
Extensibility
Plugins can extend indexing, analysis, request handling and query parsing, and the source can be modified.Read 15 Oct 2026 · solr.apache.org
Faceting
Term, query, range, date and pivot faceting are built in for filtering and data exploration.Read 15 Oct 2026 · solr.apache.org
Full-text search
It supports phrase, wildcard, join, grouping and other Lucene-powered matching methods.Read 15 Oct 2026 · solr.apache.org
Geospatial
Solr supports location filtering, polygons, latitude/longitude queries and Java Topology Suite integration.Read 15 Oct 2026 · solr.apache.org
Indexing and queries
Solr accepts documents as JSON, XML, CSV, or binary over HTTP and returns query results in those formats.Read 4 Oct 2026 · solr.apache.org
Limit: configuration and scaling
Gartner reviewers cite complex configuration, imperfect schema management, scaling difficulties and dependence on ZooKeeper.Read 15 Oct 2026 · gartner.com
Limit: documentation
G2 reviewers repeatedly request clearer documentation, more examples and better guidance for beginners.Read 15 Oct 2026 · g2.com
Limit: learning curve
Reviewers report that Solr is complex for newcomers and requires substantial technical skill during setup and operation.Read 15 Oct 2026 · gartner.com
Limit: real-time and UI gaps
G2 reviews mention weaker real-time architecture, slow feature evolution and no built-in JavaScript data-grid component.Read 15 Oct 2026 · g2.com
Maker funding model
Crunchbase describes the foundation as a US nonprofit funded by individual donations and corporate sponsors.Read 15 Oct 2026 · crunchbase.com
Maker headquarters and size
LinkedIn lists the Apache Software Foundation headquarters in Wilmington, Delaware, with 5,001–10,000 employees.Read 15 Oct 2026 · linkedin.com
Maker legal name
The legal entity behind Solr is The Apache Software Foundation, a nonprofit established in 1999.Read 15 Oct 2026 · crunchbase.com
Native client
SolrJ is the native Java client and Solr 10 keeps its client-library minimum at JDK 17.Read 15 Oct 2026 · solr.apache.org
Notable news
Apache announced Solr 10.0.0 on March 3, 2026, including Java 21 support and expanded vector-search capabilities.Read 15 Oct 2026 · solr.apache.org
OpenAPI
The 10.0.0 download includes a machine-readable Solr OpenAPI specification.Read 15 Oct 2026 · solr.apache.org
Praise: flexibility and integration
Reviewers highlight flexible queries, easy API integration, configurable schemas and broad data-source support.Read 15 Oct 2026 · capterra.com
Praise: performance and search
Independent reviewers repeatedly praise fast indexing, strong search performance, scalability and handling of large datasets.Read 15 Oct 2026 · g2.com
Rating on Capterra
4.3 out of 5 from 14 reviewsRead 15 Oct 2026 · capterra.com
Rating on G2
4.1 out of 5 from 26 reviewsRead 15 Oct 2026 · g2.com
Rating on Gartner Peer Insights
4.2 out of 5 from 47 ratingsRead 15 Oct 2026 · gartner.com
Rating on Info-Tech
6.3 out of 10 from 12 reviewsRead 15 Oct 2026 · infotech.com
Rating on TrustRadius
7.9 out of 10 from 45 reviewsRead 15 Oct 2026 · trustradius.com
REST API
Solr exposes REST-style HTTP interfaces usable from applications written in any language.Read 15 Oct 2026 · solr.apache.org
Rich content
Solr integrates Apache Tika to extract and process rich content such as PDF and Microsoft Word documents.Read 4 Oct 2026 · solr.apache.org
Rich document parsing
Apache Tika integration extracts content from formats such as PDF and Microsoft Word.Read 15 Oct 2026 · solr.apache.org
Scalability
SolrCloud uses ZooKeeper for distributed replication, rebalancing, failover and cluster scaling.Read 15 Oct 2026 · solr.apache.org
Search engine foundation
Solr is built on the Apache Lucene information-retrieval library.Read 15 Oct 2026 · solr.apache.org
Search platform
Solr is an open-source, multimodal search platform built on Apache Lucene’s full-text, vector, and geospatial search capabilities.Read 4 Oct 2026 · solr.apache.org
Security controls
Solr documents TLS, authentication, role-based authorization and ZooKeeper ACL protection.Read 15 Oct 2026 · solr.apache.org
Security exposure warning
The project states that no Solr API, including the Admin UI, is intended for exposure to untrusted parties.Read 15 Oct 2026 · solr.apache.org
Security features
Solr lists SSL, authentication, and role-based authorization as built-in security capabilities.Read 4 Oct 2026 · solr.apache.org
System requirements
Solr 10 requires Java 21 or newer for the server; supported operating systems include Linux, macOS and Windows.Read 15 Oct 2026 · solr.apache.org

Plans and prices

Apache Solr Free Open-source search platform · binary and source releases · Apache License, Version 2.0 Read 4 Oct 2026 · solr.apache.org
Apache Solr Free Free Source and binary releases · self-hosted deployment · no usage fee Read 15 Oct 2026 · apache.org

Every Apache Solr plan and price →

Strong points and limits

Strong points

  • Free open-source Apache License
  • Full-text, vector, and geospatial search
  • Distributed indexing and automated failover
  • Faceting and result-clustering tools
  • Runs on Linux, macOS, and Windows

Limits

  • Self-hosted deployment required
  • Releases are not scheduled in advance
  • Versions below 9.10 are end of life
  • No free trial is listed

Who it suits

Solr suits teams building self-hosted search for projects ranging from weekend applications to global enterprises. It fits developers needing REST access, distributed indexing, vector search, and rich discovery features.

Verdict

Apache Solr offers a broad, self-hosted search stack with hybrid capabilities, distributed operation, administration, and security features. Its free license suits varied projects, but operators must manage deployment and avoid unsupported older releases.

Where Specifiction places it

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