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Head-to-head · RDF Databases

Fluree DB vs OpenLink Virtuoso

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Fluree DB #4 in RDF Databases 8.9/10 Free plan Free plan✓ 3 of 3 features Visit Fluree
OpenLink Virtuoso #5 in RDF Databases 8.8/10 Open source · 30-day trial Free trial✓ 0 of 3 features Visit site

Fluree DB leads on 0 checks, OpenLink Virtuoso on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFluree DB · 8.9/10
  • Free planonly Fluree DB
  • Free trialonly OpenLink Virtuoso
  • Most featuresFluree DB · 3 of 3

Fluree DB scores higher on our rubric for rdf databases: 8.9 against 8.8 out of 10; our editors rank them #4 and #5.

Fluree DB is the better fit for modern open-source RDF with search and lineage. OpenLink Virtuoso is the better fit for RDF plus relational SQL workloads.

  • Fluree DB fits best

    Modern open-source RDF with search and lineage

  • 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 Fluree DB 8.9/10 Visit ↗ OpenLink Virtuoso 8.8/10 Visit ↗
At a glance
Editor score 8.9 8.8
Ranking #4 in RDF Databases #5 in RDF Databases
Best for Modern open-source RDF with search and lineage RDF plus relational SQL workloads
Pricing model Free Free
Starting price Free Free
Free plan ✓ (best) Not checked yet
Free trial — 30 days
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Windows, macOS, Linux
Support Email, Community, Docs Tickets, Community, Docs
Integrations 300+ integrations 8 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Fluree DB 3/3 · OpenLink Virtuoso 0/3
Reasoning support ✓ (best) Not checked yet
RDF-star support ✓ (best) Not checked yet
Federated queries ✓ (best) Not checked yet
Specs
Deployment options Not checked yet Not checked yet
SPARQL support Sparql 1.1 Not checked yet
Supported RDF formats JSON-LD, Turtle, N-Triples, N-Quads, TriG Not checked yet
Our review
Pros
  • Free open-source plan with local and self-hosted deployment
  • Combines reasoning, time travel, branching, and query-time policies
  • Built-in BM25 full-text, HNSW vector, and federated search
  • 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
  • Enterprise pricing is custom
  • The feature set may exceed the needs of simple RDF projects
  • Cloud deployment is offered, but plan-level cloud details are limited
  • 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

Fluree DB is an open-source semantic graph database for developers and organizations building governed knowledge graphs and AI data foundations. It stores RDF data in an immutable, temporal ledger and supports JSON-LD, SPARQL 1.1, RDFS,…

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. Fluree DBRDF Databases 8.9Free plan
  2. OpenLink VirtuosoRDF Databases 8.8Open source · 30-day trial

Strengths and trade-offs

  • Fluree DB — where it wins

    • Free open-source plan with local and self-hosted deployment
    • Combines reasoning, time travel, branching, and query-time policies
    • Built-in BM25 full-text, HNSW vector, and federated search

    Where it doesn't

    • Enterprise pricing is custom
    • The feature set may exceed the needs of simple RDF projects
    • Cloud deployment is offered, but plan-level cloud details are limited

  • 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
  • Fluree DB8.9/10 · Free plan

    An open-source RDF database for governed knowledge graphs and AI data foundations.

    Visit FlureeFull 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