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Apache Solr vs Virtuoso Universal Server

Both stand on spatial databases. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Apache Solr

Free plan Open source APILinuxMac+3

Solr combines varied search modes with distributed operation, administration, and listed security capabilities. Note that older versions below 9.10 no longer receive updates, and future release timing is not announced in advance.

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Virtuoso Universal Server

Free plan Open source APILinuxMac+3

Choose Virtuoso if you need a multi-model database that can present data from different sources through one view, with both open-source and commercial licensing available. The open-source version is under GPL, while commercial licenses add features such as high-availability replication and professional support. Look elsewhere if the Personal workstation limits are too small or you need a published Enterprise price.

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The facts

Apache SolrVirtuoso Universal Server
Free planYesYes
Open sourceYesYes
Runs onAPI, Linux, Mac, Self-hosted, Web, WindowsAPI, Linux, Mac, Self-hosted, Web, Windows
Lowest paid planFree or on requestSee the plans
Plans published24
MakerNot publishedNot published
Websitesolr.apache.orgvirtuoso.openlinksw.com
On spatial databases#1 of 40#3 of 40

Apache Solr: what it does well

  • Supports full-text, vector, and geospatial search.
  • Offers faceting, autocomplete, and result clustering.
  • Provides distributed indexing and automated failover.
  • Includes SSL, authentication, and role-based authorization.

What to know first

  • Release dates are not scheduled in advance.
  • Versions below 9.10 are end of life.

Virtuoso Universal Server: what it does well

  • Supports relational SQL, RDF, SPARQL, XML, JSON, and web services.
  • Virtualization provides a unified view across multiple data sources.
  • External connections include HTTP, ODBC, and JDBC.
  • Available under open-source GPL and commercial licenses.
  • Deployment options include on-premises/BYOL, AWS, and Azure.

What to know first

  • Personal workstation license is limited to 2 concurrent users and 2 CPU cores.
  • Developer and Project licenses are workstation licenses.
  • Encryption at rest is listed as a commercial feature.
  • Enterprise pricing uses custom licensing terms.

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