Solr is an open source NoSQL enterprise search platform built on Apache Lucene. Supporting distributed search and index replication, Solr is highly reliable, scalable and fault tolerant. It runs as a standalone full-text search server with a REST-like API and provides features including hit highlighting, faceted search, near real-time indexing, dynamic clustering, database integration, and geospatial search. Currently, Solr powers some of the highest-traffic websites and applications in the world.


In 2004, CNET Networks, an American media website, started Solr to support search capability and later donated to Apache Software Foundation as a open-source project in 2006. In 2007, graduated as a top-level project (TLP), Solr grew steadily with more features and supported several popular websites. Finally in 2010, Solr was merged with Lucene as a sub project and changed the version number to 3.1 after Solr 1.4 to match that of Lucene.

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Source Code

Tech Docs


Apache Software Foundation

Country of Origin


Start Year


Project Type

Open Source

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Supported languages

C#, C++, Clojure, Go, Java, JavaScript, Lua, Perl, PHP, Python, R, Ruby, Rust, Scala

Operating Systems

Linux, OS X, Windows


Apache v2