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Head-to-head · Knowledge Graph Software

Stardog vs AllegroGraph

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Stardog #5 in Knowledge Graph Software 8.8/10 Free plan Free plan✓ 0 of 4 features Visit Stardog
AllegroGraph #6 in Knowledge Graph Software 8.6/10 Free plan Free plan✓ 4 of 4 features Visit AllegroGraph

Stardog leads on 0 checks, AllegroGraph 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 scoreStardog · 8.8/10
  • Free planboth
  • Most featuresAllegroGraph · 4 of 4

Stardog scores higher on our rubric for knowledge graph software: 8.8 against 8.6 out of 10; our editors rank them #5 and #6.

Stardog is the better fit for federated knowledge graphs across enterprise data. AllegroGraph is the better fit for enterprise semantic graphs with advanced operations.

  • Stardog fits best

    Federated knowledge graphs across enterprise data

  • AllegroGraph fits best

    Enterprise semantic graphs with advanced operations

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Side by side

Feature Stardog 8.8/10 Visit ↗ AllegroGraph 8.6/10 Visit ↗
At a glance
Editor score 8.8 8.6
Ranking #5 in Knowledge Graph Software #6 in Knowledge Graph Software
Best for Federated knowledge graphs across enterprise data Enterprise semantic graphs with advanced operations
Pricing model Free plan + paid Free plan + paid
Starting price — —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web, Windows, macOS, Linux
Support Community, Docs · 24/7 Email, Docs
Integrations 20 integrations 9 integrations
Built for Mid-market, Enterprise Mid-market, Enterprise
Features Stardog 0/4 · AllegroGraph 4/4
Ontology modeling Not checked yet ✓ (best)
Semantic reasoning Not checked yet ✓ (best)
RDF/SPARQL support Not checked yet ✓ (best)
Graph visualization Not checked yet ✓ (best)
Specs
Import formats Not checked yet JSON-LD, N-Quads, N-Triples, Extended N-Quads, RDF/XML, TriG, TriX, Turtle, JSON, JSONLines, CSV
Deployment Not checked yet Both
Query languages Not checked yet SPARQL, Prolog
Our review
Pros
  • Queries remote data through virtual graphs without necessarily moving it
  • Supports SPARQL, SQL, GraphQL, REST, inference, and ontology management
  • Offers both managed cloud and self-managed enterprise deployment
  • 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
Cons
  • The Free plan is limited to 1 million stored edges
  • Enterprise pricing requires contacting sales
  • It is proprietary rather than open source
  • Enterprise pricing is quote-based
  • Advanced capabilities may exceed the needs of smaller graph projects
  • The Free plan is limited to 5 million triples
Our verdict

Stardog is a knowledge-graph and semantic AI platform for enterprises that need to connect and query distributed data. Its virtual graphs and connectors work with relational, NoSQL, file, cloud, and SPARQL sources, while SPARQL, SQL-based…

Read the review →

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 →
  1. StardogKnowledge Graph Software 8.8Free plan
  2. AllegroGraphKnowledge Graph Software 8.6Free plan

Strengths and trade-offs

  • Stardog — where it wins

    • Queries remote data through virtual graphs without necessarily moving it
    • Supports SPARQL, SQL, GraphQL, REST, inference, and ontology management
    • Offers both managed cloud and self-managed enterprise deployment

    Where it doesn't

    • The Free plan is limited to 1 million stored edges
    • Enterprise pricing requires contacting sales
    • It is proprietary rather than open source

  • 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

More comparisons

All knowledge graph software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update