Apache Solr vs Sphinx
Apache Solr: The original Lucene search server: battle-tested, Apache-governed, now with GPU-accelerated vectors. Sphinx: Veteran C++ full-text search server with SphinxQL, still shipping as Sphinx 3.
key differences
- Licensing: Apache Solr is open source (permissive) (Apache License 2.0); Sphinx is proprietary (Sphinx 3: free binaries, dual-licensed (2.x was GPL-2.0)).
- Apache Solr is built for larger datasets (≤ 1 PB) than Sphinx (≤ 10 TB).
- Horizontal scaling is native in Apache Solr and manual in Sphinx.
- Transactions: Apache Solr offers limited ACID; Sphinx offers none.
- Only Apache Solr has joins, ttl / expiry, role-based access, online schema changes.
choose apache-solr for
- +Enterprise and intranet search
- +Digital library and publishing search
- +E-commerce catalog faceting
- +Hybrid keyword and vector retrieval on existing Solr estates
best at · Search, Vector search, RAG
choose sphinx for
- +Maintaining existing Sphinx deployments
- +MySQL-backed site search
- +Forum and classifieds search
best at · Search, Vector search
Apache Solr vs Sphinx: FAQ
What is the difference between Apache Solr and Sphinx?
Apache Solr: The original Lucene search server: battle-tested, Apache-governed, now with GPU-accelerated vectors. Sphinx: Veteran C++ full-text search server with SphinxQL, still shipping as Sphinx 3. Licensing: Apache Solr is open source (permissive) (Apache License 2.0); Sphinx is proprietary (Sphinx 3: free binaries, dual-licensed (2.x was GPL-2.0)). Apache Solr is built for larger datasets (≤ 1 PB) than Sphinx (≤ 10 TB). Horizontal scaling is native in Apache Solr and manual in Sphinx.
When should I choose Apache Solr over Sphinx?
Choose Apache Solr for enterprise and intranet search; digital library and publishing search; and E-commerce catalog faceting. Choose Sphinx for maintaining existing Sphinx deployments; MySQL-backed site search; and forum and classifieds search.
Is Apache Solr or Sphinx more popular?
Apache Solr ranks #46 on the WhichDB Score (39.8/100) and Sphinx ranks #389 (5.2/100). Popularity is not fit: check the requirements that matter for your project.
Are Apache Solr and Sphinx open source?
Yes. Apache Solr is open source. License: Apache License 2.0. No. Sphinx is proprietary, closed-source software. License: Sphinx 3: free binaries, dual-licensed (2.x was GPL-2.0).