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Head-to-head · RDF Databases

Stardog vs OpenLink Virtuoso

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Stardog #3 in RDF Databases 9.0/10 Free plan Free plan✓ 0 of 3 features Visit Stardog
OpenLink Virtuoso #5 in RDF Databases 8.8/10 Open source · 30-day trial Free trial✓ 0 of 3 features Visit site

Stardog leads on 0 checks, OpenLink Virtuoso on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreStardog · 9.0/10
  • Free planonly Stardog
  • Free trialonly OpenLink Virtuoso

Stardog scores higher on our rubric for rdf databases: 9.0 against 8.8 out of 10; our editors rank them #3 and #5.

Stardog is the better fit for enterprise virtual graphs and data federation. OpenLink Virtuoso is the better fit for RDF plus relational SQL workloads.

  • Stardog fits best

    Enterprise virtual graphs and data federation

  • OpenLink Virtuoso fits best

    RDF plus relational SQL workloads

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Stardog 9.0/10 Visit ↗ OpenLink Virtuoso 8.8/10 Visit ↗
At a glance
Editor score 9.0 8.8
Ranking #3 in RDF Databases #5 in RDF Databases
Best for Enterprise virtual graphs and data federation RDF plus relational SQL workloads
Pricing model Free plan + paid Free
Starting price — Free
Free plan ✓ (best) Not checked yet
Free trial — 30 days
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Windows, macOS, Linux
Support Community, Docs · 24/7 Tickets, Community, Docs
Compliance SOC 2 GDPR
Integrations 20 integrations 8 integrations
Built for Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Stardog 0/3 · OpenLink Virtuoso 0/3
Reasoning support Not checked yet Not checked yet
RDF-star support Not checked yet Not checked yet
Federated queries Not checked yet Not checked yet
Specs
Deployment options Not checked yet Not checked yet
SPARQL support Not checked yet Not checked yet
Supported RDF formats Not checked yet Not checked yet
Our review
Pros
  • Virtual graphs query remote relational, NoSQL, file, and SPARQL sources
  • Federation, inference, ontology management, caching, and scheduled triggers
  • Cloud and self-managed deployment with SQL, REST, GraphQL, and CLI access
  • Combines relational SQL, native RDF quads, SPARQL, and SPASQL
  • Connects to remote SQL and XML sources through virtual databases
  • Includes replication, clustering, and role-based and row-level security
Cons
  • The Free plan is limited to 1 million stored edges
  • Free uses shared cloud hosting and includes community support
  • Enterprise pricing is contact-sales only
  • Commercial offer dates are historical and require pricing confirmation
  • Advanced Enterprise capabilities use custom licensing terms
  • Its broad multi-model scope may exceed a single-purpose RDF database
Our verdict

Stardog is a knowledge-graph and semantic AI platform for enterprises that need to connect and query distributed data. Its virtual graphs can work across relational, NoSQL, file, cloud, and SPARQL sources without necessarily moving that…

Read the review →

OpenLink Virtuoso is a cross-platform multi-model database and data integration platform for organizations working with relational, RDF, graph, XML, and federated data. It suits teams that need SQL alongside RDF storage and graph querying,…

Read the review →
  1. StardogRDF Databases 9.0Free plan
  2. OpenLink VirtuosoRDF Databases 8.8Open source · 30-day trial

Strengths and trade-offs

  • Stardog — where it wins

    • Virtual graphs query remote relational, NoSQL, file, and SPARQL sources
    • Federation, inference, ontology management, caching, and scheduled triggers
    • Cloud and self-managed deployment with SQL, REST, GraphQL, and CLI access

    Where it doesn't

    • The Free plan is limited to 1 million stored edges
    • Free uses shared cloud hosting and includes community support
    • Enterprise pricing is contact-sales only

  • OpenLink Virtuoso — where it wins

    • Combines relational SQL, native RDF quads, SPARQL, and SPASQL
    • Connects to remote SQL and XML sources through virtual databases
    • Includes replication, clustering, and role-based and row-level security

    Where it doesn't

    • Commercial offer dates are historical and require pricing confirmation
    • Advanced Enterprise capabilities use custom licensing terms
    • Its broad multi-model scope may exceed a single-purpose RDF database
  • Stardog9.0/10 · Free plan

    A broad enterprise platform for federated queries, virtual graphs, and semantic reasoning.

    Visit StardogFull verdict →
  • OpenLink Virtuoso8.8/10 · Open source · 30-day trial

    A cross-platform choice for teams combining relational SQL with RDF and graph workloads.

    Visit siteFull verdict →

More comparisons

All RDF databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update