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Head-to-head · RDF Databases

OpenLink Virtuoso vs RDFox

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score OpenLink Virtuoso #5 in RDF Databases 8.8/10 Open source · 30-day trial Free trial✓ 0 of 3 features Visit site
RDFox #8 in RDF Databases 8.4/10 Pricing on request ✓ 0 of 3 features Visit RDFox

OpenLink Virtuoso leads on 0 checks, RDFox 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 scoreOpenLink Virtuoso · 8.8/10
  • Free trialonly OpenLink Virtuoso

OpenLink Virtuoso scores higher on our rubric for rdf databases: 8.8 against 8.4 out of 10; our editors rank them #5 and #8.

OpenLink Virtuoso is the better fit for RDF plus relational SQL workloads. RDFox is the better fit for enterprises needing advanced semantic reasoning.

  • OpenLink Virtuoso fits best

    RDF plus relational SQL workloads

  • RDFox fits best

    Enterprises needing advanced semantic reasoning

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 OpenLink Virtuoso 8.8/10 Visit ↗ RDFox 8.4/10 Visit ↗
At a glance
Editor score 8.8 8.4
Ranking #5 in RDF Databases #8 in RDF Databases
Best for RDF plus relational SQL workloads Enterprises needing advanced semantic reasoning
Pricing model Free Paid
Starting price Free Pricing on request
Free plan Not checked yet —
Free trial 30 days —
Deployment Cloud, Self-hosted Cloud, Self-hosted, Desktop
Platforms Windows, macOS, Linux Web, Windows, macOS, Linux
Support Tickets, Community, Docs Email, Community, Docs
Integrations 8 integrations 2 integrations
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features OpenLink Virtuoso 0/3 · RDFox 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
  • 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
  • Supports SPARQL 1.1, OWL 2, SWRL and Datalog reasoning.
  • Incremental reasoning can materialize derived facts automatically.
  • Offers REST and Java APIs, a web console and high availability.
Cons
  • 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
  • No free plan; access to pricing requires contacting sales.
  • Its semantic reasoning focus may exceed simpler RDF storage needs.
  • Deployment and API options may require technical setup.
Our verdict

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 →

RDFox is an in-memory knowledge graph database and semantic reasoning engine from Oxford Semantic Technologies. It stores RDF data, supports SPARQL 1.1 queries, and derives facts from rules and ontological axioms. The product is aimed at…

Read the review →
  1. OpenLink VirtuosoRDF Databases 8.8Open source · 30-day trial
  2. RDFoxRDF Databases 8.4Pricing on request

Strengths and trade-offs

  • 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

  • RDFox — where it wins

    • Supports SPARQL 1.1, OWL 2, SWRL and Datalog reasoning.
    • Incremental reasoning can materialize derived facts automatically.
    • Offers REST and Java APIs, a web console and high availability.

    Where it doesn't

    • No free plan; access to pricing requires contacting sales.
    • Its semantic reasoning focus may exceed simpler RDF storage needs.
    • Deployment and API options may require technical setup.
  • 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 →
  • RDFox8.4/10 · Pricing on request

    RDFox combines SPARQL querying with rule-based and ontology-driven reasoning for RDF data.

    Visit RDFoxFull 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