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RadiAnt DICOM Viewer alternatives: 4 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave RadiAnt DICOM Viewer: windows only, and time-limited subscription; access ends when the plan expires. We ranked 4 alternatives by how directly each one replaces RadiAnt DICOM Viewer, then by reviews, real visits and how recently each app's facts were checked against its own website. Weasis currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Weasis logoWeasisOpen sourceYesWindows, macOS, Linux5 of 566.5
2Horos logoHorosOpen sourceYesmacOS4 of 462.6
33D Slicer logo3D SlicerOpen sourceYesWindows, macOS, Linux4 of 459.6
4OsiriX MD logoOsiriX MDPaidNomacOS, iOS4 of 450.3
  1. Weasis logo

    1. WeasisTop pick

    Best for: Hospitals, researchers and clinicians who want a free DICOM viewer that plugs into PACS and web portals

    Open sourceWindows, macOS, Linux

    66.5

    score / 100

    Why switch from RadiAnt DICOM Viewer

    Free and open source, runs on Windows, macOS and Linux, and has stronger PACS and web portal integration.

    Pros

    • 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

    Cons

    • 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
    Visit Weasis 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 Weasis a good RadiAnt DICOM Viewer alternative?

    Verified facts

    5 of 5 verified
    License
    EPL 2.0 or Apache 2.0
    Checked Oct 29, 2026github.com(opens source in a new tab)
    Platforms
    Windows, macOS, Linux
    Checked Oct 29, 2026github.com(opens source in a new tab)
    PACS integration
    PACS and web archives
    Checked Oct 29, 2026weasis.org(opens source in a new tab)
    Offline mode
    Yes
    Checked Oct 29, 2026weasis.org(opens source in a new tab)
    3D and MPR
    Yes
    Checked Oct 29, 2026weasis.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

    62.6

    score / 100

    Why switch from RadiAnt DICOM Viewer

    Free open-source option for anyone moving to a Mac who wants a full DICOM workstation.

    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 ×0.387
    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 RadiAnt DICOM Viewer 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. 3D Slicer logo

    3. 3D Slicer

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

    Open sourceWindows, macOS, Linux

    59.6

    score / 100

    Why switch from RadiAnt DICOM Viewer

    Free and cross-platform, with much more segmentation and 3D analysis for research work.

    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 ×0.377
    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 3D Slicer a good RadiAnt DICOM Viewer 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)
  4. OsiriX MD logo

    4. OsiriX MD

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

    PaidmacOS, iOS

    50.3

    score / 100

    Why switch from RadiAnt DICOM Viewer

    Certified Mac workstation with more advanced 3D and 4D post-processing.

    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 ×0.346
    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 RadiAnt DICOM Viewer 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 RadiAnt DICOM Viewer alternative for…

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

Weasis logo

Best RadiAnt DICOM Viewer alternative for most people

Weasis

Free and open source, runs on Windows, macOS and Linux, and has stronger PACS and web portal integration.

Horos logo

Best RadiAnt DICOM Viewer alternative for a free option

Horos

Free open-source option for anyone moving to a Mac who wants a full DICOM workstation.

3D Slicer logo

Best RadiAnt DICOM Viewer alternative for open source

3D Slicer

Free and cross-platform, with much more segmentation and 3D analysis for research work.

OsiriX MD logo

Best RadiAnt DICOM Viewer alternative for Mac

OsiriX MD

Certified Mac workstation with more advanced 3D and 4D post-processing.

Weasis logo

Best RadiAnt DICOM Viewer alternative for Windows

Weasis

Free and open source, runs on Windows, macOS and Linux, and has stronger PACS and web portal integration.

Weasis logo

Best RadiAnt DICOM Viewer alternative for Linux

Weasis

Free and open source, runs on Windows, macOS and Linux, and has stronger PACS and web portal integration.

RadiAnt DICOM Viewer alternatives: common questions

What is the best alternative to RadiAnt DICOM Viewer?

Weasis ranks first right now. Free and open source, runs on Windows, macOS and Linux, and has stronger PACS and web portal integration. Horos and 3D Slicer follow it in our ranking.

Is there a free alternative to RadiAnt DICOM Viewer?

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

Is there an open-source alternative to RadiAnt DICOM Viewer?

Yes: Weasis, Horos and 3D Slicer.

Which RadiAnt DICOM Viewer alternatives work on Linux?

Weasis and 3D Slicer run on Linux.

Why do people switch from RadiAnt DICOM Viewer?

The complaints we hear most: windows only; time-limited subscription; access ends when the plan expires; no FDA or CE certification, so not for diagnosis.

How is this list ranked?

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