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Head-to-head · Knowledge Graph Software

Protégé vs AllegroGraph

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Protégé #2 in Knowledge Graph Software 9.1/10 Free plan Free plan✓ 4 of 4 features Visit Protégé
AllegroGraph #6 in Knowledge Graph Software 8.6/10 Free plan Free plan✓ 4 of 4 features Visit AllegroGraph

Protégé 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 scoreProtégé · 9.1/10
  • Free planboth

Protégé scores higher on our rubric for knowledge graph software: 9.1 against 8.6 out of 10; our editors rank them #2 and #6.

Protégé is the better fit for ontology engineers and collaborative OWL modeling. AllegroGraph is the better fit for enterprise semantic graphs with advanced operations.

  • Protégé fits best

    Ontology engineers and collaborative OWL modeling

  • AllegroGraph fits best

    Enterprise semantic graphs with advanced operations

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Side by side

Feature Protégé 9.1/10 Visit ↗ AllegroGraph 8.6/10 Visit ↗
At a glance
Editor score 9.1 8.6
Ranking #2 in Knowledge Graph Software #6 in Knowledge Graph Software
Best for Ontology engineers and collaborative OWL modeling Enterprise semantic graphs with advanced operations
Pricing model Free Free plan + paid
Starting price Free plan —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop Cloud, Self-hosted
Platforms Web, Windows, macOS, Linux Web, Windows, macOS, Linux
Support Community, Docs Email, Docs
Built for Solo, Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Protégé 4/4 · AllegroGraph 4/4
Ontology modeling ✓ ✓
Semantic reasoning ✓ ✓
RDF/SPARQL support ✓ ✓
Graph visualization ✓ ✓
Specs
Import formats RDF/XML, Turtle, OWL/XML, OBO JSON-LD, N-Quads, N-Triples, Extended N-Quads, RDF/XML, TriG, TriX, Turtle, JSON, JSONLines, CSV
Deployment Both Both
Query languages SPARQL SPARQL, Prolog
Our review
Pros
  • Free and open source across desktop and browser-based workflows
  • Supports OWL 2, RDF, reasoning, visualization, querying, and refactoring
  • Adds collaboration, permissions, revision history, and plug-in extensibility
  • 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
  • Primarily focused on ontology development rather than operational graph management
  • SPARQL is documented as a plugin for Protégé-OWL 4.2
  • Collaborative WebProtégé workflows differ from local desktop editing
  • 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

Protégé is a free, open-source ontology development environment for researchers, organizations, and governments. It combines Protégé Desktop, which runs locally, with WebProtégé, a browser-based editor for collaborative work without…

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. ProtégéKnowledge Graph Software 9.1Free plan
  2. AllegroGraphKnowledge Graph Software 8.6Free plan

Strengths and trade-offs

  • Protégé — where it wins

    • Free and open source across desktop and browser-based workflows
    • Supports OWL 2, RDF, reasoning, visualization, querying, and refactoring
    • Adds collaboration, permissions, revision history, and plug-in extensibility

    Where it doesn't

    • Primarily focused on ontology development rather than operational graph management
    • SPARQL is documented as a plugin for Protégé-OWL 4.2
    • Collaborative WebProtégé workflows differ from local desktop editing

  • 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