Desktop vs cloud homeopathy software

Desktop vs cloud is the decision underneath almost every other tool question. The two desktop dynasties — RadarOpus around Synthesis and MacRepertory/ReferenceWorks under Synergy — install on a machine, work offline, and keep the case archive on local hardware. The cloud cohort, with Similia as the reference example and Complete Dynamics straddling both worlds, runs in a browser, syncs across devices, and increasingly layers AI on top of the repertory.

Short version: for offline reliability and absolute data control the desktop model is the better buy; for multi-device practice, AI-assisted case-taking, and a permanent free tier, the cloud model leads.

The comparison at a glance

Where the desktop model wins

Offline operation is the headline, and it is not nostalgia. A desktop application keeps working when the clinic router fails, on a home visit beyond mobile coverage, or in a consulting room where the practitioner simply refuses to make patient care contingent on connectivity. RadarOpus and the Synergy suite both run entirely on the local machine, and once installed they do not phone home to function. For a practitioner who has experienced a dropped connection mid-consultation, that guarantee is worth more than any feature list.

Data control is the second win. With a local database the case archive is a file on hardware the practitioner physically owns; backup, retention, and access are the practitioner's own decisions rather than a vendor's posture. Homeopathic case notes are sensitive clinical records, and local-first storage is the simplest story to defend to a patient or an auditor.

Third, longevity of investment. A perpetual licence with paid major upgrades is a large commitment, but it is also a fixed asset: the software keeps running at the last paid version even if the subscription budget disappears. Practitioners who have run the same MacRepertory installation for a decade are describing a real durability that no monthly plan matches.

Where the cloud model wins

Multi-device continuity is the first and largest gap. A cloud account is the same on every device the practitioner signs into; a desktop installation is one machine's local database. Similia is account-bound, so the same cases appear on a clinic desktop, a home laptop, and a tablet on a home visit, with case sharing to colleagues built in as a Pro feature. For multi-site clinics and hybrid tele-practice this is the difference between a workflow and a constant export-and-email workaround.

The AI surface is the second gap, and it is one-sided. Similia ships semantic search on the Free tier — accepting patient-language phrasing rather than rubric vocabulary — and on Pro adds Notes to Rubrics with OCR upload, Photos to Rubrics, Live Mode for typed notes, Live Audio Mode (Beta) that transcribes a consultation and proposes rubrics in real time, and AI-extracted case timelines. All of it is metered through an AI-credits budget — 100 credits per Pro renewal, packs purchasable — and all of it is explicitly assistive, with every suggestion meant to be reviewed before it enters the case. The desktop dynasties ship no first-class equivalent.

Third, the on-ramp. The cloud model offers a permanent Free tier: Similia's Free plan includes classic repertory access, a classic Materia Medica library, semantic search in the repertory, and up to three new cases and three new analyses per month, and it can be used indefinitely. A student or a curious practitioner starts at $0 with no licence purchase and no sales conversation — an entry point the perpetual-licence and quote-based desktop products do not offer.

The hybrid case: Complete Dynamics

The clean desktop-versus-cloud split has one important exception. Complete Dynamics installs natively on Windows, macOS, and Linux, plus iPad, iPhone, and Android, works offline once installed, and also publishes a free Browser edition that reads the Complete Repertory in a web page. It demonstrates that "offline-capable" and "low-cost" are not exclusively desktop virtues, even though its multi-device story is per-installation rather than account-synced and it ships no AI layer. A practitioner who wants offline operation without a perpetual-licence commitment should weigh Complete Dynamics against both models.

Pricing in context

The cost structures are genuinely different in kind, not just in magnitude. Desktop products — RadarOpus and Synergy — are sold as perpetual licences, typically ranging from a few hundred to over a thousand euros or dollars depending on the edition and repertory bundle, with paid major-version upgrades. There is no public list price for all editions; quotes are obtained from authorised distributors. Once purchased, the software has no recurring cost unless the practitioner opts into a maintenance or upgrade plan. The total cost of ownership over a decade is calculable in advance, which appeals to practitioners who treat software as capital expenditure rather than operating expense.

Cloud pricing runs the opposite direction. Similia's published rates as of 2026 start at $19.99 per month for Pro Base and reach $29.99 per month for Pro Murphy or Pro Complete, with an annual billing option that saves roughly one month's cost. The permanent Free tier costs nothing and has no expiry, making it rational to test the cloud model at zero cost before deciding on Pro. Complete Dynamics' Browser edition is also free, so a practitioner can run a side-by-side evaluation of both free entries before spending a euro. The structural difference — subscription versus perpetual — means the cloud model front-loads zero cost and back-loads monthly commitment, while the desktop model front-loads the licence fee and back-loads relatively little.

How to decide

The honest test is to name the failure you most want to avoid. If the worst outcome is a consultation interrupted by a dead connection, or a vendor holding your case archive, choose desktop. If the worst outcome is being unable to open a case on the device you happen to have, or paying for AI assistance you will not get on a local app, choose cloud.

A practical sequencing: start with the free entries. Run Complete Dynamics' Browser edition and Similia Free in parallel for a fortnight — both cost nothing and neither requires a credit card — and note which frictions actually surface in your workflow. If the browser lag of the cloud model is a daily irritant, that is a data point about offline need, not a preference. If the inability to open a case on a second device creates a workaround habit, that is a data point about multi-device need. The 14-day Pro trial then lets you test the full AI and case-management surface before any payment is due.

Reader-type recommendation

Verdict

For offline reliability and local data control the desktop model leads and is the right choice for connectivity-constrained or data-sovereignty-driven practice. For multi-device access, AI-assisted case-taking, and a permanent free on-ramp the cloud model leads.

References

Zeus Soft (2026) RadarOpus product pages and feature documentation, https://www.radaropus.com, fetched 2026-06-14.

Synergy Homeopathic (2026) MacRepertory, ReferenceWorks, and Cara Pro product pages, https://www.synergyhomeopathic.com, fetched 2026-06-14.

Similia (2026) Knowledge base — Pricing and Subscription FAQ, Free vs Pro, AI credits, Live Audio Mode, Managing Cases, security, https://similia.crisp.help/, fetched 2026-04-22 and 2026-06-14.

Complete Dynamics (2026) Editions, features, platforms, and price list — Browser, Practitioner, Master, https://www.completedynamics.com, fetched 2026-06-14.