CoinyMoiny is the cozy digital studio for graders, stackers, and die-variety hunters — a Sheldon scale companion, a melt value engine, and a private collection vault that works fully offline.
From raw coins to certified slabs, from junk silver bags to constitutional gold — one clear workflow for it all.
Assess condition from Poor-1 to Perfect Uncirculated-70 using detailed wear criteria for luster, strikes, and contact marks.
Record toning, rim nicks, cleaning indicators, and eye appeal ratings for every coin in your ledger.
Catalog raw uncertified coins alongside certified slabs — PCGS, NGC, ANACS — with cert numbers and grade notes.
Compute exact intrinsic melt values for gold, silver, platinum, and copper coins based on fine weight and purity.
Calculate melt margins for junk silver bags, pre-1965 circulating coinage, and constitutional gold in seconds.
Track total fine silver and gold troy ounces across your entire numismatic vault at a glance.
Log die clashes, doubled dies (DDO/DDR), repunched mint marks (RPM), and planchet errors with precision.
Store high-resolution, high-contrast macro photos of obverses, reverses, and edge lettering.
Track acquisition prices, dealer origins, auction records, and estimated fair market values.
Two real CoinyMoiny mechanics, live in your browser — no download required.
Drag the slider to see how a coin's condition maps to its numeric grade.
Estimate intrinsic melt value from weight, purity, and spot price.
We're a small crew of numismatists, bullion stackers, and error hunters who got tired of juggling spreadsheets, dog-eared grading guides, and scattered photo folders. CoinyMoiny is the workspace we wished existed — a single, cozy ledger for everything that happens between "found a coin" and "know exactly what it's worth."
Our mission is simple: replace guesswork with grounded process. Coin grading shouldn't live only in an expert's memory, and melt math shouldn't require a separate calculator app. We build tools that turn Sheldon scale assessment, precious metal valuation, and mint mark tracking into a clear, repeatable routine anyone can trust.
Open CoinyMoiny and you get an interactive Sheldon Scale guide for condition grading, a bullion melt engine for gold, silver, platinum, and copper, a die variety and mint error journal, a macro photo archive, and portfolio analytics that break your holdings down by era, metal, grade, and country — all in one private digital vault.
Whether you're stacking junk silver, chasing a doubled die, or archiving a lifetime collection, CoinyMoiny keeps your data organized, accurate, and entirely your own — no internet connection required. Our tagline says it best:
CoinyMoiny was built on a simple principle: your collection is private. The app does not collect, store, or transmit any personal data whatsoever. Every grading note, melt calculation, and macro photo lives exclusively on your device, in your control, for as long as you decide to keep it.
CoinyMoiny collects nothing. We do not ask for your name, email, location, device identifiers, or any other personal detail. There are no sign-ups, no accounts, and no forms — you open the app and start logging coins.
Because nothing is collected, nothing is used. We do not analyze your grading habits, your melt calculations, your die variety notes, or your purchase records. There is no behavioral profiling, no telemetry, and nothing to sell — ever.
Your entire numismatic vault — grades, certification numbers, macro photos, purchase history, and portfolio charts — is stored locally on your own device. Nothing is synced to a cloud service, and nothing leaves your phone or tablet unless you personally choose to export or share it.
CoinyMoiny contains no analytics kits, no advertising networks, and no third-party trackers. The Sheldon Scale guide, melt formulas, and grading references all run using logic built directly into the app, with no outbound calls required.
Since your collection records never travel across a network, there is no transmission to intercept and no remote server to breach. Your data's safety depends on your device's own security, which remains fully under your control.
CoinyMoiny does not knowingly or unknowingly collect information from anyone, including children. Because no data of any kind is gathered from any user, the app is inherently compliant with children's privacy protections such as COPPA.
There are no accounts to manage and no servers holding your information, so there is nothing for us to delete on your behalf. If you wish to remove your data, simply uninstall the app — your local records are removed along with it.
If our approach to privacy ever changes, we will update this page with a new effective date and describe the change plainly, in the same spirit of transparency reflected here today.
Questions about this policy are always welcome at privacy@coinymoinyapp.com.
🪶 Got a grading question, a feature idea, or a rare die variety you're proud of? We genuinely love hearing from fellow collectors — write in any time.
⏱️ We typically reply within 24–48 hours — coin in hand, kettle on.