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Protégé
What it is
Protégé is an ontology editor for building and managing ontologies, available as the desktop application Protégé Desktop and the browser-based WebProtégé. Both editions support OWL 2 and are described as cross-compatible. WebProtégé enables collaborative viewing and editing, with sharing, permissions, threaded discussions, watches, email notifications, and revision history. Ontologies can be uploaded and downloaded in formats such as RDF/XML, Turtle, OWL/XML, and OBO. Protégé Desktop connects directly to description logic reasoners including HermiT and Pellet. It supports multiple ontologies in one workspace, ontology structure visualization, inference explanations, and refactoring operations. Desktop is written in Java and has a plug-in architecture for extensions. The project says it is used by researchers, organisations, and governments worldwide. Protégé is free and open source. Support is offered through mailing lists monitored by team members and experienced community users, though users must subscribe before posting. Documentation includes FAQs, tutorials, user guides, and developer documentation. Protégé originated at the Stanford Division of Computational Medicine at Stanford University School of Medicine; Desktop is community maintained, with Damien Goutte-Gattat identified as its current primary maintainer.
For and against
For
- Desktop and browser-based editing options.
- Both editions support OWL 2.
- WebProtégé includes collaboration and revision history.
- Desktop connects to HermiT and Pellet reasoners.
- Free and open source.
Against
- Mailing-list users must subscribe before posting.
- Desktop is community maintained.
The verdict
Protégé offers both desktop ontology tools and collaborative browser editing, with support for OWL 2. Users seeking help through its mailing lists must subscribe before posting.
Who it suits
Protégé suits researchers and other users building or managing ontologies, whether they prefer desktop tools or browser-based collaboration. Its OWL 2 support and reasoning connections are relevant to ontology modeling workflows.
Plans and prices
Protégé Desktop and WebProtégé
Desktop requires Java · WebProtégé runs in a browser · OWL 2 ontology editing
Read 15 Oct 2026 · protege.stanford.edu
On the record
- Collaboration
- WebProtégé provides sharing, permissions, threaded discussions, watches, email notifications, and revision history.protege.stanford.edu · read 15 Oct 2026
- Cross compatibility
- WebProtégé and Protégé Desktop are described as cross compatible with each other.protege.stanford.edu · read 30 Sep 2026
- Current release
- The official site lists Protégé Desktop version 5.6.9.protege.stanford.edu · read 15 Oct 2026
- Desktop editor
- Protégé Desktop is a standalone application for editing multiple ontologies in one workspace.protege.stanford.edu · read 15 Oct 2026
- Desktop reasoning
- Protégé Desktop connects directly to description logic reasoners including HermiT and Pellet.protege.stanford.edu · read 30 Sep 2026
- Desktop tools
- Protégé Desktop supports multiple ontologies in one workspace, ontology structure visualization, inference explanations, and refactoring operations.protege.stanford.edu · read 30 Sep 2026
- Developer API
- The WebProtégé repository contains separate server API, client, CLI, and core modules.github.com · read 15 Oct 2026
- Documentation
- Protégé documentation includes FAQs, tutorials, user guides, and developer documentation.protege.stanford.edu · read 30 Sep 2026
- Documentation depth
- Official documentation includes installation, getting started, views, menus, class-expression syntax, FAQs, tutorials, user guides, and developer documentation.protegeproject.github.io · read 15 Oct 2026
- Editions
- Protégé is available as the desktop application Protégé Desktop and the browser based editor WebProtégé.protege.stanford.edu · read 30 Sep 2026
- Extensibility
- Protégé Desktop is written in Java and uses a plug-in architecture for extensions.protege.stanford.edu · read 30 Sep 2026
- File formats
- WebProtégé ontologies can be uploaded and downloaded in RDF/XML, Turtle, OWL/XML, OBO, and other formats.protege.stanford.edu · read 30 Sep 2026
- History
- The project began at Stanford in the 1980s as Mark Musen’s doctoral research and has been developed for more than three decades.protege.stanford.edu · read 15 Oct 2026
- Import and export
- WebProtégé supports ontology upload and download in RDF/XML, Turtle, OWL/XML, OBO, and other formats.protege.stanford.edu · read 15 Oct 2026
- Independent comparison
- A comparative academic paper evaluates Protégé alongside Swoop, Vitro, and Fluent as ontology-building tools for Semantic Web work.ijcseonline.org · read 15 Oct 2026
- Independent description
- Wikipedia identifies Protégé as Java software for Linux, Mac OS X, and Windows with a BSD 2-Clause license and plug-in framework.en.wikipedia.org · read 15 Oct 2026
- Java requirement
- The platform-independent desktop download requires Java.protege.stanford.edu · read 15 Oct 2026
- License
- Protégé Desktop is released under the BSD 2-Clause license.github.com · read 15 Oct 2026
