About NumisLens

Why NumisLens Exists

NumisLens started as a personal project — a response to a problem most collectors know well. Over time, a collection outgrows the tools used to track it. Spreadsheets fall out of sync. Photos scatter across folders and phone backups. Reference notes live in separate notebooks. When documentation matters — for insurance, for estate planning, or simply for knowing exactly what you own — pulling it all together takes more effort than it should.

NumisLens exists to give collectors a single, reliable place to keep that record.

The Catalog

Behind NumisLens is a catalog of over 81,000 coin types drawn from the major numismatic reference systems. Coverage spans Roman Imperial coinage (RIC), Roman Republican coinage (RRC), provincial issues (RPC), Greek and Hellenistic series (BMC), and the Sear catalogues (SEAR). Denominations, mint assignments, obverse and reverse descriptions, date ranges, and metal classifications are recorded for each type and cross-referenced across systems where the records overlap.

The catalog was built through the systematic analysis of over 12,000 reference coins — matching examples to catalog numbers, recording image data, and verifying attributions across systems. The aim was not to reproduce existing references but to make them searchable and practically useful for attribution work.

The Identify tool lets you search this catalog by ruler, catalog reference, denomination, or description to find an exact match for a coin you own or are considering.

Reference Guides

NumisLens publishes in-depth reference guides for major series. These go beyond the catalog: they provide historical context, attribution guidance, market pricing based on recent auction results, and an overview of the key types for each ruler. Current guides cover Augustus and Constantine I, with more in progress. Each guide is written for collectors who already know the basics and want accurate, referenced information they can act on.

What NumisLens Is For

NumisLens is designed for individual collectors who need a clear, well-documented record of what they own. Primary use cases include:

• Recording coins and banknotes with photos, descriptions, and attribution notes
• Storing catalog references (RIC, BMC, SEAR, RPC, and others) alongside personal records
• Tracking acquisition costs, estimated values, and condition grades
• Preparing documentation for insurance, estate planning, or personal reference
• Exporting collection data in structured formats for external use

The app supports ancient, world, and U.S. coinage, as well as banknotes.

What NumisLens Is Not

NumisLens is not an appraisal service, a pricing authority, an authentication or grading service, or an insurance provider. All values and descriptions entered in the app are provided by the user — based on purchase price, recent auction research, or dealer estimates — and exist for personal reference only. NumisLens does not guarantee accuracy, market value, or acceptance by any insurer or third party.

For full details, see our Terms of Service.

Design Philosophy

The goal of NumisLens is not to replace how people collect. Many collectors work with physical albums, slabs, binders, and handwritten notes. NumisLens is designed to sit alongside those systems — providing a reliable digital record without disrupting the habits that make collecting worthwhile.

The visual design draws from the language of numismatic catalogues and auction references: structured, readable, and built for long-term use rather than novelty. The same standard applies to the guides and catalog data — referenced, cross-checked, and written for collectors who take the subject seriously.