Head-to-head · Knowledge Graph Software
AllegroGraph vs OpenLink Virtuoso
AllegroGraph leads on 0 checks, OpenLink Virtuoso on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreAllegroGraph · 8.6/10
- Free planonly AllegroGraph
- Free trialonly OpenLink Virtuoso
- Most featuresAllegroGraph · 4 of 4
AllegroGraph scores higher on our rubric for knowledge graph software: 8.6 against 8.1 out of 10; our editors rank them #6 and #8.
AllegroGraph is the better fit for enterprise semantic graphs with advanced operations. OpenLink Virtuoso is the better fit for mature hybrid SQL and RDF deployments.
- AllegroGraph fits best
Enterprise semantic graphs with advanced operations
- OpenLink Virtuoso fits best
Mature hybrid SQL and RDF deployments
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Side by side
| Feature | AllegroGraph 8.6/10 Visit ↗ | OpenLink Virtuoso 8.1/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 8.6 | 8.1 |
| Ranking | #6 in Knowledge Graph Software | #8 in Knowledge Graph Software |
| Best for | Enterprise semantic graphs with advanced operations | Mature hybrid SQL and RDF deployments |
| 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 | Windows, macOS, Linux |
| Support | Email, Docs | Tickets, Community, Docs |
| Integrations | 9 integrations | 8 integrations |
| Built for | Mid-market, Enterprise | Small business, Mid-market, Enterprise |
| Features AllegroGraph 4/4 · OpenLink Virtuoso 0/4 | ||
| Ontology modeling | ✓ (best) | Not checked yet |
| Semantic reasoning | ✓ (best) | Not checked yet |
| RDF/SPARQL support | ✓ (best) | Not checked yet |
| Graph visualization | ✓ (best) | Not checked yet |
| Specs | ||
| Import formats | JSON-LD, N-Quads, N-Triples, Extended N-Quads, RDF/XML, TriG, TriX, Turtle, JSON, JSONLines, CSV | Not checked yet |
| Deployment | Both | Both |
| Query languages | SPARQL, Prolog | Not checked yet |
| Our review | ||
| Pros |
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| Cons |
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| Our verdict | AllegroGraph is a semantic graph database for organizations building knowledge graphs, data fabrics, and AI applications. It stores RDF, graph, vector, document, and temporal data, with support for SPARQL, OWL reasoning, SHACL, rules, and… 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 combines a relational SQL engine with native RDF quad storage,… Read the review → |
Strengths and trade-offs
AllegroGraph — where it wins
- Free plan supports up to 5 million triples without expiration
- Combines SPARQL, Prolog, RDF storage, and semantic reasoning
- Supports sharding, federation, replication, and cloud or on-premises deployment
Where it doesn't
- Enterprise pricing is quote-based
- Advanced capabilities may exceed the needs of smaller graph projects
- The Free plan is limited to 5 million triples
OpenLink Virtuoso — where it wins
- Combines SQL, RDF quad storage, SPARQL, and relational RDF views
- Supports replication, clustering, virtualization, and web-service deployment
- Connects through ODBC, JDBC, ADO.NET, OLE-DB, GraphQL, and HTTP
Where it doesn't
- Its broad scope may exceed the needs of narrow graph-only projects
- Enterprise capabilities use custom licensing terms
- Advanced deployments require database and data-integration expertise
- AllegroGraph8.6/10 · Free plan
A mature graph database combining semantic reasoning, operations, visualization, and AI features.
Visit AllegroGraphFull verdict → - OpenLink Virtuoso8.1/10 · Open source · 30-day trial
A broad open-source platform for teams combining relational and RDF workloads.
Visit OpenLinkFull verdict →
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All knowledge graph software comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update