Weasis
Free, open-source DICOM viewer for medical images that connects to hospital PACS systems.
- Verified facts
- 5 of 5
- Alternatives ranked
- 4
- Approved reviews
- 0
- Visits sent from here
- 0
About Weasis
Weasis is an open-source viewer for medical images in the DICOM format, with roots at the University Hospitals of Geneva where it is used in production. It opens common exam types such as CT, MR, ultrasound, X-ray, mammography and PET, plus ECGs, structured reports, segmentations and radiotherapy plans, and offers 2D reading, multiplanar reconstruction, 3D volume rendering, measurements and annotations. Its main strength is integration: it can query and retrieve from a PACS over classic DICOM or DICOMweb, be launched from a web portal or EHR with a weasis:// link, and export studies as DICOMDIR, ZIP or a CD image with the viewer embedded. Native installers exist for Windows, macOS and Linux, and it also works offline from local folders or discs. It is free under EPL 2.0 or Apache 2.0. The interface is less polished than paid workstations, and setting up PACS links is work for an administrator rather than a patient.
Best for: Hospitals, researchers and clinicians who want a free DICOM viewer that plugs into PACS and web portals.
Pros and cons
What works
- Free and open source under EPL 2.0 or Apache 2.0
- PACS and DICOMweb query, retrieve and send built in
- MPR and 3D volume rendering alongside 2D reading
- Desktop installers for Windows, macOS and Linux
Why people leave
- Integration settings are aimed at IT staff, not casual users
- Less polished interface than commercial workstations
- Only the native-installer edition is maintained since version 4
Top Weasis alternatives
See all 4- 1
3D Slicer66.5Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions.
- 2
RadiAnt DICOM Viewer62.6Fast, polished Windows viewer with PACS client and 3D views, for users who prefer a paid, simpler app.
- 3
Horos59.6Free open-source viewer for Mac users who want an OsiriX-style workstation instead of a Java app.
- 4
OsiriX MD52.2Certified commercial Mac workstation for clinics that need FDA clearance.
Why people left Weasis
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Weasis: common questions
Is Weasis free?
Yes. Weasis is free, open-source software.
Is Weasis open source?
Yes. The source code is on GitHub at nroduit/Weasis.
What platforms does Weasis run on?
Weasis is available for Windows, macOS and Linux.
What are the best alternatives to Weasis?
The highest-ranked Weasis alternatives right now are 3D Slicer, RadiAnt DICOM Viewer and Horos. See the full ranked list for pricing, platforms and verified facts.