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Weasis alternatives: 4 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave Weasis: integration settings are aimed at IT staff, not casual users, and less polished interface than commercial workstations. We ranked 4 alternatives by how directly each one replaces Weasis, then by reviews, real visits and how recently each app's facts were checked against its own website. 3D Slicer currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
13D Slicer logo3D SlicerOpen sourceYesWindows, macOS, Linux4 of 466.5
2Horos logoHorosOpen sourceYesmacOS4 of 459.6
3OsiriX MD logoOsiriX MDPaidNomacOS, iOS4 of 452.2
  1. 3D Slicer logo

    1. 3D SlicerTop pick

    Best for: Researchers and labs who need segmentation, 3D models and scripting on medical images

    Open sourceWindows, macOS, Linux

    66.5

    score / 100

    Why switch from Weasis

    Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions.

    Pros

    • Free and open source, backed by long-running NIH grants
    • Segmentation, registration and 3D modelling built in
    • Large extension catalogue and Python scripting
    • Runs on Windows, macOS and Linux

    Cons

    • Steep learning curve for simple viewing tasks
    • Not certified for clinical diagnosis
    • Heavy download and interface compared with lightweight viewers
    Visit 3D Slicer Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is 3D Slicer a good Weasis alternative?

    Verified facts

    4 of 4 verified
    Open source
    Yes
    Checked Nov 1, 2026github.com(opens source in a new tab)
    Platforms
    Windows, macOS, Linux
    Checked Nov 1, 2026download.slicer.org(opens source in a new tab)
    Funding
    US National Institutes of Health grants
    Checked Nov 1, 2026download.slicer.org(opens source in a new tab)
    Price
    Free
    Checked Nov 1, 2026download.slicer.org(opens source in a new tab)
  2. Horos logo

    2. Horos

    Best for: Mac users who want a free OsiriX-style DICOM workstation

    Open sourcemacOS

    59.6

    score / 100

    Why switch from Weasis

    Free open-source viewer for Mac users who want an OsiriX-style workstation instead of a Java app.

    Pros

    • Free and open source under LGPL 3.0
    • Full workstation with database, PACS and 3D rendering
    • Familiar workflow for former OsiriX users

    Cons

    • macOS only
    • Not certified for clinical diagnosis
    • Release cadence is slow compared with commercial viewers
    Visit Horos Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Horos a good Weasis alternative?

    Verified facts

    4 of 4 verified
    License
    LGPL-3.0
    Checked Nov 1, 2026github.com(opens source in a new tab)
    Platform
    macOS
    Checked Nov 1, 2026github.com(opens source in a new tab)
    Based on
    OsiriX
    Checked Nov 1, 2026github.com(opens source in a new tab)
    Price
    Free
    Checked Nov 1, 2026github.com(opens source in a new tab)
  3. OsiriX MD logo

    3. OsiriX MD

    Best for: Radiologists and clinics on Macs who need a certified DICOM workstation

    PaidmacOS, iOS

    52.2

    score / 100

    Why switch from Weasis

    Certified commercial Mac workstation for clinics that need FDA clearance.

    Pros

    • FDA-cleared and CE-labelled for diagnostic use
    • Deep 2D, 3D and 4D post-processing, including PET-CT
    • Plugin system for custom research tools

    Cons

    • Runs only on Apple hardware
    • Subscription pricing adds up compared with free viewers
    • Free Lite version marks images as not for medical use
    Visit OsiriX MD Details and reviews
    How this score is calculated
    Editorial fit ×0.352
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is OsiriX MD a good Weasis alternative?

    Verified facts

    4 of 4 verified
    Starting price
    $69.99/month
    Checked Oct 29, 2026osirix-viewer.com(opens source in a new tab)
    Certification
    FDA Class II, CE IIa
    Checked Oct 29, 2026osirix-viewer.com(opens source in a new tab)
    Platforms
    macOS only
    Checked Oct 29, 2026osirix-viewer.com(opens source in a new tab)
    Free version
    OsiriX Lite (not for medical use)
    Checked Oct 29, 2026osirix-viewer.com(opens source in a new tab)

The best Weasis alternative for…

The highest-ranked app in this list for each need.

3D Slicer logo

Best Weasis alternative for most people

3D Slicer

Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions.

Horos logo

Best Weasis alternative for a free option

Horos

Free open-source viewer for Mac users who want an OsiriX-style workstation instead of a Java app.

3D Slicer logo

Best Weasis alternative for open source

3D Slicer

Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions.

OsiriX MD logo

Best Weasis alternative for Mac

OsiriX MD

Certified commercial Mac workstation for clinics that need FDA clearance.

RadiAnt DICOM Viewer logo

Best Weasis alternative for Windows

RadiAnt DICOM Viewer

Fast, polished Windows viewer with PACS client and 3D views, for users who prefer a paid, simpler app.

3D Slicer logo

Best Weasis alternative for Linux

3D Slicer

Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions.

Weasis alternatives: common questions

What is the best alternative to Weasis?

3D Slicer ranks first right now. Also free and open source, with much deeper segmentation, 3D modelling and research tools through extensions. RadiAnt DICOM Viewer and Horos follow it in our ranking.

Is there a free alternative to Weasis?

Yes. 3D Slicer (open source) and Horos (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Weasis?

Yes: 3D Slicer and Horos.

Which Weasis alternatives work on Linux?

3D Slicer runs on Linux.

Why do people switch from Weasis?

The complaints we hear most: 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.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Weasis, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.