One program.
The whole world of numismatics.
Hundreds of auction houses, shops and archives from around the world in one place — plus a metal calculator, collection tracking and full personalization in 11 languages.
This solves a real, concrete problem — a numismatic collector who wants to check prices or find an auction would normally have to manually click through dozens of pages. You get 400+ of them in one place, plus a metal calculator with a live rate, plus price archives. This isn’t "another browser tab" — it’s real time saved.
The program is 100% safe
An official Chrome extension, reviewed and approved by Google — nothing to download, no installation outside the browser.
- All data stays local — nothing is sent to any external server.
- Open, verifiable code — the program doesn't hide what it does.
- Zero ads and tracking — no trackers, no hidden fees.
- Installed directly from the Chrome Web Store — passes Google's official review, zero system warnings.
- Runs only in its own browser tab — no access to other websites you visit.
Everything arranged exactly the way you want it
Tiles you can freely drag, resize and color — your own, fully editable layout.
Tiles, bars and full personalization
Every entry is a tile with an automatically fetched company logo — drag it, resize it in any direction, color it.
- Drag and resize — with automatic view scrolling and built-in protection against tiles overlapping each other.
- Full-width separator bars — organize sections visually, with any color you like.
- Multi-select (Ctrl+click) — move or delete entire groups in one motion.
- Custom section and menu names — make the whole program your own, including dragging menu order.
Metal calculator with a live NBP exchange rate
Gold price fetched automatically from the official, free API of the National Bank of Poland.
- Automatic rate fetching on every opening, with a visible publication date.
- Fineness in two formats — "585" or "0.585", the program understands both notations.
- Calculation history always at hand.
Numismatic search dorks — search like a professional
11 coin categories with ready-made, precise search queries.
- Thaler, ducat, ort, three-groschen, groschen, shilling, denarius, rouble and more — each with its own set of queries.
- Multilingual queries at once, targeting the world's largest auction platforms.
- Add your own queries — expand the list with proven phrases.
Auction archives — check what it actually sold for
A dedicated section with databases of closed auctions and historical sale results.
- CoinArchives, Acsearch, NGC Auction Central and other trusted databases in one place.
- Fully editable — add your own archives you come across.
Catalogs — your own PDF files inside the program
Add your own files (PDF, images, documents) directly into the program.
- Saved permanently — they survive closing and reopening the program.
- Preview in place or download with one click.
Ready for customers from around the world
Polish
Full, native translation of every interface element.
English
Full English translation for international collectors.
German
Complete German translation of the entire interface.
Français
Traduction française complète de toute l'interface.
Italiano
Traduzione italiana completa di tutta l'interfaccia.
Español
Traducción española completa de toda la interfaz.
Nederlands
Volledige Nederlandse vertaling van de hele interface.
Čeština
Kompletní český překlad celého rozhraní.
Svenska
Fullständig svensk översättning av hela gränssnittet.
Română
Traducere completă în română a întregii interfețe.
Ukrainian
Full interface translation into Ukrainian.
How to start — from download to activation
Four simple steps, taking just a few minutes.
1️⃣ ADD TO CHROME
One click on the button below — no files to download, no installation, no Windows security warnings.
2️⃣ BUY A LICENSE
Click "Buy now", choose a plan and pay online — fast, no extra steps.
3️⃣ ENTER YOUR EMAIL AND ACTIVATE
Open the extension, enter the e-mail address used at purchase and click "Activate". The program checks your license instantly and unlocks — no key to copy.
Literally everything NUMIS_SYSTEM can do
📂 LINK SECTIONS
- Auctions — hundreds of auction houses from around the world.
- Shops and Polish Shops — trusted numismatic sellers.
- Auction archives — databases of closed auctions and historical prices.
- Catalogs — reference databases plus your own PDF files.
- Facebook Groups, Tools, Useful Links — the rest of the numismatic internet in one place.
🧩 TILES, BARS AND LAYOUT
- Drag and resize in any direction, with full protection against tile overlap.
- Full-width separator bars, with any color you like.
- Multi-select (Ctrl+click), bulk move and delete.
- Tile opacity and size sliders, light/dark mode.
- A-Z / Z-A sorting and search across all sections at once.
🔍 NUMISMATIC SEARCH DORKS
- 11 categories: thaler, ducat, ort, three-groschen, groschen, shilling, denarius, rouble, Prague groschen, Greek coin, bracteate.
- Multilingual queries, targeting the world's largest auction platforms at once.
- Ability to add your own, proven queries.
⚖️ METAL CALCULATOR
- Automatic gold price fetching from the official NBP API.
- Value calculation based on weight and fineness, in two notation formats.
- Recent calculation history, safe offline operation.
💰 COLLECTION AND HISTORY
- Track your own coins with automatic profit/loss calculation.
- Favorites, browsing history with one-click clearing.
- Scheduled auctions with countdown and notifications.
🌐 FOUR LANGUAGES AND SECURITY
- Full translation: Polish, English, German, Ukrainian.
- All data stays local in your browser — zero data sent to external servers.
- License secured with an RSA-PSS-SHA256 cryptographic signature.
- Automatic weekly backup, export/import of the full configuration.
Choose the plan that suits you
Full access to all features in every plan — the only difference is license length.
- Full feature access
- Updates
- Technical support
Currency prices are approximate — the exact rate (NBP) is shown inside the program.
Ready to get started?
Get NUMIS_SYSTEM and have the whole world of numismatics in one, safe place.
BUY NOW