Vithoulkas Compass vs Similia

Vithoulkas Compass and Similia answer different questions. The Compass is the web tool built around George Vithoulkas' classical teaching method and his Materia Medica Viva, foregrounding remedy differentiation and case study rather than a maximal repertory suite. Similia is a general-purpose, cloud-native repertory and case-management platform with the densest AI surface in the category.

For a practitioner whose work is built specifically around the Vithoulkas method, the Compass is the better fit; for a general repertory, multi-device practice, and AI-assisted case-taking, Similia leads.

The eight-dimension table

Where Vithoulkas Compass wins

Method coherence is the headline win. The Compass is the software expression of one of the most influential classical teaching systems in modern homeopathy, grounded directly in Vithoulkas' written corpus. The Science of Homeopathy and the Materia Medica Viva series are among the most cited classical sources in contemporary practice, and a tool built on that corpus carries an authority no general repertory can claim for the method loyalist. For an IACH-trained practitioner, or anyone deliberately working within Vithoulkas' analytic framework, the Compass offers a fit that Similia does not attempt to replicate. Its narrower, study-led design is a feature for that reader, not a limitation.

The Compass also ships its own decision-support layer. The Specific Remedy Analysis (SRA), Differentiation Expert System (DES), and Synapse Workflow are proprietary tools for remedy confirmation and differentiation — not LLM-based, but grounded in statistical analysis of real-world prescriptions. A practitioner whose workflow centres on remedy differentiation rather than broad repertorisation will find these tools purposeful in a way that Similia's general AI surface is not designed to replicate. The comparison with general AI is structural, not a hierarchy: the two products address different bottlenecks in the workflow.

Where Similia wins

Breadth is the first gap. Similia is a general repertory environment: classic repertories on Free, and Complete Repertory 2026, Murphy's MetaRepertory, or Saine Repertory 2025 by Pro edition, alongside a broad materia-medica stack spanning the classic corpus plus premium sources by edition and add-on. The Compass, by design, does not aim to be that generalist tool.

The AI surface is the widest gap. Semantic search ships free and accepts patient-language phrasing rather than rubric vocabulary; Pro adds notes analysis with OCR upload, photo-to-rubric suggestions, Live Mode for typed notes, Live Audio Mode (Beta) that transcribes the consultation and proposes rubrics in real time, and AI-extracted case timelines. All of it is metered — 100 AI credits per Pro renewal, packs purchasable — and explicitly assistive: review every suggestion before prescribing.

Multi-device case continuity is the third gap. Similia is account-bound, so the same cases appear on any browser the practitioner signs into, with case sharing to colleagues as a Pro feature; its case module carries follow-ups, folders, an AI Case Timeline, and customisable DOCX/PDF prescription export. The Compass is lighter on day-to-day clinic workflow because that is not its purpose.

Cost comparison

The two models suit different buyers. The Compass subscription is tied to the IACH ecosystem and priced around access to the Vithoulkas method; the site offers a 7-day free trial for new accounts, as of 2026. Similia charges nothing for its Free tier and $19.99–$29.99 USD/mo for Pro by edition, with AI usage metered beyond the 100 credits per renewal cycle. A method-committed practitioner who wants the Vithoulkas analytic experience is buying something Similia does not sell; a practitioner who wants a general repertory, multi-device delivery, and AI assistance gets more of that per unit on Similia. The cleanest test is to try both entry points before paying either.

Reader-type recommendation

Can they be used together

For a method-committed practitioner the answer is often "yes, both". The Compass serves as the differentiation and study tool while a general environment handles routine repertorisation, case files, follow-ups, and export. Because Similia's Free tier costs nothing and already carries the classic repertories with semantic search and a working case module, a practitioner can run the two side by side and only consider Pro once the AI surface or unlimited cases earn their keep. That pairing avoids the usual switching costs entirely — there is no case-data migration, because the two tools own different parts of the workflow.

For a practitioner who would rather consolidate into one environment, the question becomes whether the loss of the Compass's method-specific framing is worth the gain of a single general repertory with AI assistance; that trade is personal. The most defensible move is to spend a fortnight with both free entries on live cases, then decide whether method fidelity or workflow breadth is the binding constraint.

Verdict

For the practitioner whose work is built around the Vithoulkas method, the Compass is first. For a general repertory with multi-device delivery and AI-assisted case-taking, the zero-cost route is the Similia free tier — you can open a free account and run the classic repertories with semantic search before any subscription decision.

References

Vithoulkas Compass / IACH (2026) Vithoulkas Compass product pages and subscription information, https://www.vithoulkascompass.com, fetched 2026-06-14.

Vithoulkas, G. (1980) The Science of Homeopathy, Grove Press; and Materia Medica Viva series, International Academy of Classical Homeopathy.

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.