Synthesis Repertory online — what it is and where to read it
The Synthesis repertory — Frederik Schroyens's Repertorium Homeopathicum Syntheticum — is one of the two large synthetic repertories that dominate modern practice, alongside van Zandvoort's Complete Repertory.
What the Synthesis is
Schroyens built the Synthesis on the Kentian skeleton, then expanded it by adding source-coded material from across the homeopathic literature — Boenninghausen, Boger, Hering, journal additions, and clinical contributions — with each remedy entry keyed to the source that contributed it. That source coding is the editorial spine of the project: it lets a practitioner see why a remedy appears in a rubric, and, in software, filter an analysis by the authors or schools they trust.
The Synthesis and the Complete Repertory are siblings in method, both descending from Kent's 1897 chapter-and-organ arrangement. They diverge in editorial choices — which additions are admitted, how grades are assigned, how authors are tagged — but share the same architectural inheritance.
Reading the Synthesis online
Because the Synthesis is a copyrighted, editioned work, a legitimate online Synthesis is a licensed edition inside a platform, not a free scan. Historically it has been most closely associated with the RadarOpus desktop suite, where it shipped as the flagship repertory. Choosing where to read the Synthesis online therefore means choosing a platform and an edition together — and when citing a rubric, name the edition, because the synthetic repertories revise over time.
What a given platform actually licenses varies. Some modern cloud platforms include the Kentian and classical core (Kent, Boericke, Hering, Boger, Boenninghausen's Therapeutic Pocketbook) together with a current source-coded synthetic edition such as the Complete Repertory 2026, Murphy's MetaRepertory, and the Saine Repertory 2025, rather than the Synthesis itself. For a practitioner whose method depends on a source-coded synthetic repertory with author filters, the Complete on a platform that exposes author/source filtering — with presets for common author groups — delivers the same editorial discipline the Synthesis pioneered, and adds semantic search and live analysis on top.
A practical workflow: pick a platform that lets you search the free repertory by symptom, apply author filters to restrict the analysis to the schools you trust, and record the edition you used alongside each prescription.
References
Schroyens, F. (ed.) (1987 onward) Synthesis: Repertorium Homeopathicum Syntheticum, Homeopathic Book Publishers / Archibel.
Kent, J. T. (1897) Repertory of the Homoeopathic Materia Medica, Lancaster: Examiner Printing House.
Kent, J. T. (1900) Lectures on Homoeopathic Philosophy, Chicago: Ehrhart & Karl.
Hering, C. (1879–1891) The Guiding Symptoms of Our Materia Medica, Philadelphia: American Homeopathic Publishing Society.
Zeus Soft / Archibel (2026) RadarOpus documentation, https://www.radaropus.com/, fetched 2026-06-14.
Similia (2026) "Which Homeopathic Resources are Included in Similia?", Similia Help Centre, https://similia.crisp.help/en/article/which-homeopathic-resources-are-included-in-similia-16rlqbr/, fetched 2026-06-14.
Similia (2026) "Repertorization and Analysis (Selecting Rubrics)", Similia Help Centre, https://similia.crisp.help/en/article/repertorization-and-analysis-selecting-rubrics-1ywzvmz/, fetched 2026-06-14.