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Head-to-head · Knowledge Graph Software

Protégé vs Progress Semaphore

  • 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
Progress Semaphore #3 in Knowledge Graph Software 9.0/10 Pricing on request · 30-day trial Free trial✓ 4 of 4 features Visit site

Protégé leads on 1 check, Progress Semaphore on 0, and 4 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 planonly Protégé
  • Free trialonly Progress Semaphore

Protégé scores higher on our rubric for knowledge graph software: 9.1 against 9.0 out of 10; our editors rank them #2 and #3.

Protégé offers free plan; Progress Semaphore doesn't.

Protégé is the better fit for ontology engineers and collaborative OWL modeling. Progress Semaphore is the better fit for mature ontology and semantic-classification teams.

  • Protégé fits best

    Ontology engineers and collaborative OWL modeling

  • Progress Semaphore fits best

    Mature ontology and semantic-classification teams

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 Protégé 9.1/10 Visit ↗ Progress Semaphore 9.0/10 Visit ↗
At a glance
Editor score 9.1 9.0
Ranking #2 in Knowledge Graph Software #3 in Knowledge Graph Software
Best for Ontology engineers and collaborative OWL modeling Mature ontology and semantic-classification teams
Pricing model Free Paid
Starting price Free plan —
Free plan ✓ (best) —
Free trial — 30 days
Deployment Cloud, Desktop Cloud, Self-hosted
Platforms Web, Windows, macOS, Linux Web, Windows, Linux
Support Community, Docs Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Protégé 4/4 · Progress Semaphore 4/4
Ontology modeling ✓ ✓
Semantic reasoning ✓ ✓
RDF/SPARQL support ✓ ✓
Graph visualization ✓ ✓
Specs
Import formats RDF/XML, Turtle, OWL/XML, OBO RDF, Excel spreadsheets
Deployment Both Both
Query languages SPARQL SPARQL
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
  • Covers ontology, taxonomy, thesaurus, RDF, and SPARQL workflows
  • Adds classification, fact extraction, enrichment, visualization, and mapping
  • Supports web, Windows, Linux, APIs, and cloud, on-premises, or hybrid 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
  • Contact-sales pricing makes plan comparison less immediate
  • Its enterprise focus may exceed the needs of smaller teams
  • Development is limited to demos, development, and capability evaluations
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 →

Progress Semaphore is a semantic AI platform for enterprises managing knowledge models, ontologies, taxonomies, controlled vocabularies, thesauri, and metadata. It is suited to teams building enterprise knowledge graphs, semantic search,…

Read the review →
  1. ProtégéKnowledge Graph Software 9.1Free plan
  2. Progress SemaphoreKnowledge Graph Software 9.0Pricing on request · 30-day trial

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

  • Progress Semaphore — where it wins

    • Covers ontology, taxonomy, thesaurus, RDF, and SPARQL workflows
    • Adds classification, fact extraction, enrichment, visualization, and mapping
    • Supports web, Windows, Linux, APIs, and cloud, on-premises, or hybrid deployment

    Where it doesn't

    • Contact-sales pricing makes plan comparison less immediate
    • Its enterprise focus may exceed the needs of smaller teams
    • Development is limited to demos, development, and capability evaluations
  • Protégé9.1/10 · Free plan

    A strong free choice for OWL ontology work, with collaboration and reasoning options.

    Visit ProtégéFull verdict →
  • Progress Semaphore9.0/10 · Pricing on request · 30-day trial

    A mature platform for ontology management, semantic enrichment, and enterprise knowledge graphs.

    Visit siteFull verdict →

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