Protégé is a free, open-source platform that provides a growing user community with a suite of tools to construct domain models and knowledge-based applications with ontologies.

WebProtégé is an ontology development environment for the Web that makes it easy to create, upload, modify, and share ontologies for collaborative viewing and editing.

WebProtégé fully supports the latest OWL 2 Web Ontology Language. The highly configurable user interface creates the perfect environment for beginners and experts alike. Collaboration features abound, including sharing and permissions, threaded notes and discussions, watches and email notifications. RDF/XML, Turtle, OWL/XML, OBO, and other formats available for ontology upload and download.

  • W3C standards compliant
  • Simple, customizable user interface
  • Optimized for collaboration
  • Change tracking and revision history
  • Web forms for domain specific editing
  • Multiple upload/download formats
  • Cross compatible with Protégé Desktop

Use WebProtégé

Stanford Hosting Solution
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Protégé Desktop is a feature rich ontology editing environment with full support for the OWL 2 Web Ontology Language, and direct in-memory connections to description logic reasoners like HermiT and Pellet.

Protégé Desktop supports creation and editing of one or more ontologies in a single workspace via a completely customizable user interface. Visualization tools allow for interactive navigation of ontology relationships. Advanced explanation support aids in tracking down inconsistencies. Refactor operations available including ontology merging, moving axioms between ontologies, rename of multiple entities, and more.

  • W3C standards compliant
  • Customizable user interface
  • Visualization support
  • Ontology refactoring support
  • Direct interface to reasoners
  • Highly pluggable architecture
  • Cross compatible with WebProtégé

Download for Desktop

Protégé Desktop v.5.6.3
Download platform independent version (requires a Java Runtime Environment) Older versions »

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Get overviews and more in-depth information about Protégé and ontology development on the Protégé Wiki – the official home for all of our documentation. You'll find FAQs, tutorials, user guides, developer guides, and much more.

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Short Courses

»Protégé Short Course

A 3-day intensive training in ontology development, hands-on use of the Protégé toolset, and the Web Ontology Language (OWL).