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- 4 of 4
- Alternatives ranked
- 4
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About Horos
Horos is a free, open-source DICOM viewer for the Mac, built from the open-source OsiriX code base and other medical imaging libraries. It gives clinicians, students and researchers a full workstation: a study database, PACS query and retrieve, 2D reading with measurements and annotations, multiplanar reconstruction and 3D volume and surface rendering. Because it shares its roots with OsiriX, the layout and workflow will feel familiar to anyone who used that app. It is released under the LGPL 3.0 at no cost and is not sold as a certified diagnostic device. It runs only on macOS, so Windows and Linux users need another viewer. The project's release pace is slower than some commercial tools, so check that the current build supports your macOS version before relying on it.
Best for: Mac users who want a free OsiriX-style DICOM workstation.
Pros and cons
What works
- Free and open source under LGPL 3.0
- Full workstation with database, PACS and 3D rendering
- Familiar workflow for former OsiriX users
Why people leave
- macOS only
- Not certified for clinical diagnosis
- Release cadence is slow compared with commercial viewers
Top Horos alternatives
See all 4- 1
Weasis66.5Free, open source and cross-platform, with strong PACS and DICOMweb integration for mixed Mac and PC sites.
- 2
3D Slicer62.6Free and runs natively on Apple Silicon, with far more segmentation and research tooling.
- 3
RadiAnt DICOM Viewer59.6Fast, simple paid viewer for users who are moving from a Mac to Windows.
- 4
OsiriX MD54.5The commercial original Horos was forked from, with FDA clearance and faster performance for clinical reading.
Why people left Horos
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
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Reviews
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Horos: common questions
Is Horos free?
Yes. Horos is free, open-source software.
Is Horos open source?
Yes. The source code is on GitHub at horosproject/horos.
What platforms does Horos run on?
Horos is available for macOS.
What are the best alternatives to Horos?
The highest-ranked Horos alternatives right now are Weasis, 3D Slicer and RadiAnt DICOM Viewer. See the full ranked list for pricing, platforms and verified facts.