Weasis
Weasis is an open-source DICOM viewer for macOS that helps clinicians and researchers view, analyze, and share medical imaging studies.
What is Weasis?
Weasis is a native desktop medical imaging viewer for working with DICOM studies on macOS. It is designed for healthcare professionals, researchers, and other users who need to open, review, and analyze imaging data such as CT, MR, ultrasound, X-ray, PET, and related medical imaging formats. The app supports both standalone use and integration with PACS, DICOMweb, and other clinical imaging workflows, making it useful in hospitals, research environments, and patient-image review scenarios. Users can browse studies, inspect metadata, perform measurements and annotations, and use advanced viewing tools such as multiplanar reconstruction and 3D volume rendering when supported by the hardware. Weasis also supports importing images from local folders, removable media, and DICOM archives, and it can export studies and derived output for sharing or further workflow use. Published by Nicolas Roduit, it is available across macOS, Windows, and Linux.
Key features
- Open and review DICOM studies from local storage, removable media, and archives
- Browse patient, study, series, and image hierarchies in a dedicated explorer
- Measure, annotate, and inspect medical images during image review
- Use 2D, MPR, MIP, and 3D volume rendering tools for supported studies
- Connect to PACS and DICOMweb systems for clinical imaging workflows
- Export images and studies in common medical and image-sharing formats
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Safety overview
Status: Mostly safe
Weasis is legitimate medical imaging software used to open and analyze DICOM files. Access to local files, removable media, and network imaging systems is normal for its purpose. Medical images and metadata can contain sensitive patient information, so use it only with data you are authorized to handle and store exports carefully if you save screenshots, videos, or converted files.
Recommendation: Keep Weasis if you use it to review medical images or connect to imaging systems. If you no longer need it, you can remove the app, but first save any exported images, local study copies, or custom settings you want to keep.
Common paths
/Applications/Weasis.app
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