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Head-to-head · RDF Databases

AllegroGraph vs Stardog

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score AllegroGraph #2 in RDF Databases 9.1/10 Free plan Free plan✓ 0 of 3 features Visit AllegroGraph
Stardog #3 in RDF Databases 9.0/10 Free plan Free plan✓ 0 of 3 features Visit Stardog

AllegroGraph leads on 0 checks, Stardog 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 scoreAllegroGraph · 9.1/10
  • Free planboth

AllegroGraph scores higher on our rubric for rdf databases: 9.1 against 9.0 out of 10; our editors rank them #2 and #3.

AllegroGraph is the better fit for enterprise RDF, reasoning, and graph analytics. Stardog is the better fit for enterprise virtual graphs and data federation.

  • AllegroGraph fits best

    Enterprise RDF, reasoning, and graph analytics

  • Stardog fits best

    Enterprise virtual graphs and data federation

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Side by side

Feature AllegroGraph 9.1/10 Visit ↗ Stardog 9.0/10 Visit ↗
At a glance
Editor score 9.1 9.0
Ranking #2 in RDF Databases #3 in RDF Databases
Best for Enterprise RDF, reasoning, and graph analytics Enterprise virtual graphs and data federation
Pricing model Free plan + paid Free plan + paid
Starting price Free plan —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web, Linux Web
Support Email, Docs Community, Docs · 24/7
Integrations 18 integrations 20 integrations
Built for Mid-market, Enterprise Mid-market, Enterprise
Features AllegroGraph 0/3 · Stardog 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
  • Supports RDF triples and quads with SPARQL, Prolog, RDFS++, and OWL reasoning
  • Combines federation, sharding, replication, geospatial, temporal, and vector capabilities
  • Offers triple-level security plus integrations across analytics and data platforms
  • 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
Cons
  • Paid licensing is quotation-based rather than publicly listed
  • SQL support is not available
  • Its broad feature set is more specialized than a focused graph database
  • 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
Our verdict

AllegroGraph is a persistent graph database and application framework for organizations building enterprise knowledge graphs, data fabrics, semantic applications, and neuro-symbolic AI systems. It stores RDF triples and quads and supports…

Read the review →

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 →
  1. AllegroGraphRDF Databases 9.1Free plan
  2. StardogRDF Databases 9.0Free plan

Strengths and trade-offs

  • AllegroGraph — where it wins

    • Supports RDF triples and quads with SPARQL, Prolog, RDFS++, and OWL reasoning
    • Combines federation, sharding, replication, geospatial, temporal, and vector capabilities
    • Offers triple-level security plus integrations across analytics and data platforms

    Where it doesn't

    • Paid licensing is quotation-based rather than publicly listed
    • SQL support is not available
    • Its broad feature set is more specialized than a focused graph database

  • 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

More comparisons

All RDF databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update