Start with viewer versus PACS
Weasis belongs in the DICOM viewer conversation, and it is one of the best free options in it. A viewer opens a study and lets a clinician read it. That is a real, well-defined job, and Weasis does it on the desktop without charging for the privilege. It is commonly paired with a separate archive, most often the open-source dcm4chee, which is the part that actually receives and stores the studies.
That pairing is the tell. The moment you need somewhere for studies to live, arrive from the modalities, and be served to more than one person, you are no longer talking about a viewer; you are talking about a PACS. MiniPACS is that: the archive, the browser viewer and the worklist as one self-hosted system, rather than a viewer plus an archive plus the integration work between them. For the plain-language version of that distinction, see DICOM server and what is PACS.
What you assemble around Weasis
Choosing Weasis is choosing to run the reading tool for free and to own the rest yourself. In practice that means:
- An archive. Something like dcm4chee to receive from modalities and store studies, stood up and maintained by you.
- Backups. A second copy of that archive, on a separate target, that you restore from to prove it works.
- Access. Weasis is a desktop client; putting a study in front of a colleague usually means that machine, or extra work to make viewing available more widely.
- The integration. Wiring the viewer, the archive and the workflow together so studies flow without hand-holding.
For a team with the engineering time, that is a legitimate and low-cost route. If you are weighing the open-source path more broadly, the Orthanc alternative comparison and the self-hosted PACS guide walk the same trade in detail.
Where MiniPACS fits
MiniPACS is the assembled version of that stack for an independent center that would rather run imaging than integrate a viewer with an archive. It receives from the modalities, stores studies in an archive you own, and opens them in a browser in about two seconds with no desktop install. The imaging data never leaves the building, backups are yours, and it runs on a mini PC for a single site. It installs with Docker on Linux and is priced as a flat fee per location, not per study.
Weasis is the better answer when the requirement is a free, capable desktop reader. MiniPACS is the better answer when the requirement is a clinic-wide, backed-up, browser-accessible archive that works the week it is installed. To see it rather than read about it, the landing page has pricing and a live demo you can click through.
FAQ
Is Weasis a PACS?
No. Weasis is a free, open-source DICOM viewer. It opens and reads studies very well, and it is often paired with a separate archive such as dcm4chee to pull studies from. A PACS is that archive and the workflow around it: it receives studies from modalities, stores and indexes them, and serves them to users. MiniPACS is in the PACS category, with a browser viewer included, so the archive and the viewing are one system rather than two you assemble.
Is MiniPACS a Weasis replacement?
Not if the job is simply viewing DICOM on a workstation. Weasis is excellent and free for that. MiniPACS is the step up when an independent clinic needs one shared archive, browser viewing from that archive without installing a desktop client, encrypted backups it owns, and a flat price. If all you need is to open a file, keep Weasis.
When should a clinic move from Weasis to MiniPACS?
Move when the problem stops being 'open this study' and becomes 'run our imaging'. If studies need to land in one archive automatically from the modalities, appear for several users, stay backed up and exportable, and open in a browser from anywhere on the network rather than on a machine with Weasis installed, the clinic has a PACS requirement, not a viewer-only one.
Does MiniPACS still let me view like Weasis does?
Yes. MiniPACS includes a browser DICOM viewer as part of the self-hosted system, so studies open in about two seconds with no plugin and no desktop install. Weasis remains a strong choice as a heavy-duty desktop reading tool; MiniPACS is about giving the whole clinic viewing from a shared, backed-up archive.
How is MiniPACS priced?
MiniPACS is licensed flat by location: $3,600 per location per year for MiniPACS, or $7,680 per location per year for MiniPACS plus Vendo. There are no per-study fees. Weasis itself is free and open source; the cost of the Weasis route is the separate archive, backups and workflow you assemble and maintain around it.