A modern catalog for your coin collection. At last.

Snap a photo of a coin or paste an auction link.
OutOfDark helps you build a clear record with photos, parameters, price, certification, notes, and historical context.

  • No credit card
  • Your data stays safe
  • Export your data anytime

If your collection is scattered across a dozen places, you're not alone

Sound familiar? Photos on your phone. Prices in Excel. Notes in Word. Auction links in email. Purchase prices buried in invoices. Certificates you keep hunting for online. And the moment you want to know what your collection is worth or what's missing from it, the manual digging begins. 🤯

Photos on your phone
Prices in Excel
Notes in Word
Auction links in email
Purchase prices on invoices
Certifications online

This is where it ends!

OutOfDark turns chaos into order.
From now on, everything about your coins lives in one place.

Show how it works

How OutOfDark works

  1. 1. You add a coin

    Snap a photo, upload your own shots, or paste an auction link.

  2. 2. OutOfDark builds the entry

    OutOfDark builds a draft entry from your photos or an auction lot. You just check it, tweak it, and save.

  3. 3. And your collection is finally under control

    Track value, certifications, notes, history, and sharing.

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usersThe number of active OutOfDark users.
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coins cataloguedAn aggregate, anonymized number across all collections. We can't see inside individual collections.
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trades completedTotal trades across the marketplace (OutOfDark, eBay, Aukro). We can't see specific trades or their contents.

From a photo or auction lot straight into your collection

Instead of copying fifteen fields from every page, you paste an auction link, an e-shop screenshot, or simply snap both sides of the coin. OutOfDark does the rest of the work for you.

1 You add photos
Coin identification – uploaded photos of the obverse and reverse before identification
Add photos of the coin. Or a link to an auction or e-shop. Or simply a screenshot of the page.
2 The app builds the entry
Your finished catalog entry is ready for you to review and save.

What happens inside OutOfDark between step 1 and step 2?

  • Recognizes the coin's core details.
  • Fills in the legend, catalog references and historical context.
  • Cleans up the photos into a tidy catalog look.
  • Saves the provenance, price and related auction link.
You review everything before it's saved.

What OutOfDark can do

Six core features for everyday work with your collection. By collectors, for collectors.

A collection organized your way

Organize your collection exactly the way you want – your own categories, periods, rulers and mints. Every coin keeps everything in one place: photos, parameters, certification, prices and notes. Plus its own card you can print, export or share.

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OutOfDark creates the coin for you

Snap a coin with your phone or paste an auction link and OutOfDark recognizes what you're holding – ruler, denomination, year, material and certification – and pre-fills the entry. In seconds you have a finished coin you just check and save. No retyping.

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Collection value and portfolio trends

Stay on top of what your collection is worth and which pieces are the most valuable. Track purchase prices and growth over time. For precious-metal coins the value updates with the current metal price, while for rarities your own valuation stays in place.

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Marketplace and purchase planning

And when you decide to sell a coin, you list it straight from your catalog with no retyping – on Aukro, eBay or the shared OutOfDark collectors' marketplace. Photos and details carry over on their own. And for the pieces you're after, save them to a wishlist with a maximum price so you don't overpay.

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Your data stays safe

We take the safety of your collection seriously. Sensitive details are encrypted, backups run automatically every day, and you can lock your login with two-factor authentication. Your collection stays yours alone – other users can't see it and neither can we. Download your data anytime.

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Your collection in your pocket

Install OutOfDark on your phone like a regular app and keep your collection within reach anywhere – at a coin fair, an auction, an antique shop or on holiday. It works just like on a computer, with the freedom of the phone you always carry.

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Details for everyday use

The little things every collector appreciates.

Working with a coin

  • Bulk upload of photos at once
  • Automatic resizing, cropping and optimization of photos
  • Marking details right on the photo
  • Link and QR code for NGC/PCGS certification
  • Print a beautiful catalog sheet
  • Print display labels for your coins
  • Suggested coin name from the filled-in fields
  • In a few clicks we fill in details about rulers or historical context
  • Coin recognition and identification from a photo right on your phone

An overview of your collection

  • In seconds you know what your collection is worth and which pieces matter most
  • Record when, for how much and from whom you bought a coin
  • Saved filters for a quick return
  • Statistics by period, material, mint or ruler
  • Bulk actions – moving, deleting, printing, export. Saves you plenty of time.
  • Change history for every coin
  • Automatic revaluation of investment coins by the current metal price
  • Your collection on your phone for working on the go

Your collection. Your data. In your control.

  • Optional hiding of financial data in a shared link
  • Two-factor authentication for login
  • Automatic daily data backups
  • Download your data anytime
  • The safety of your data is our priority
Explore all the features in detail See the pricing

Your collection is sensitive. We do everything we can to keep it safe.

Your data stays yours alone – neither other users nor we can see it. Sensitive data is encrypted, you can lock your login with two-factor authentication, and backups run automatically every day. Only what you share or list yourself is public; you can hide financial figures and export your data anytime – you're fully in control of your whole collection.

And when one day you can't come back to your collection?

You can set it up so that, after a long spell of inactivity, OutOfDark safely hands an overview of your collection to a person you choose – with value estimates, your notes, and your personal message.

Not because you want to think about it every day. But because your collection shouldn't stay a mystery to your family.

AI Mintmaster

Your personal Mintmaster is now at your fingertips

AI Mintmaster sees the specific coin record – its parameters, category, certification and description. It helps with historical context, describing the motif, tracking down connections or suggesting what else to add to the coin.

  • Answers that account for the ruler, year of issue and category
  • Historical context right inside the coin detail
  • Helps fill in the details you're unsure about

Rudolf II., ducat

1604 Prague · gold

What was the context this issue was minted in? Is there anything I should watch out for?

AI Mintmaster

Rudolf's ducats from the Prague mint are among the sought-after issues – the Prague mint under Rudolf II. is renowned as a peak artistic period.

For this issue I'd recommend verifying the weight, diameter, legend and catalog reference. For pricier pieces, compare the specimen against verified auction records and watch out for any modern copies.

Continue the conversation...

A look inside the app

Four views of everyday work with your collection.

Detailed coin profile

A modern page for every coin – photos, parameters, certification, motif and historical context. Ready for your own records and for safe sharing.

A modern catalog

A clear catalog by ruler, period, material or mint. Several view modes for whatever you happen to need.

Pleasant, simple editing

Simple coin editing with a well-thought-out structure. Not hundreds of fields at once – just the ones that make sense. And AI Mintmaster right at hand.

Clear statistics

Track your collection's value, your portfolio's growth and your most valuable pieces in one place.

Who OutOfDark is for

Three situations where it makes the most sense.

My collection has outgrown my spreadsheet

Tens or hundreds of coins no longer fit into a spreadsheet with just a name and a price. You want a proper catalog – photos, parameters, certifications, and your own system of categories, rulers, and mints all in one place, instead of hunting through notebooks and paper labels.

I buy at auctions and want to stay on top of prices

You track purchase prices, current value, and how your collection evolves over time. OutOfDark keeps acquisition prices and estimates together – from a single coin to the whole collection – so you can tell whether you're buying well.

I need to document my collection and share it safely

You want your collection documented for yourself, your insurance, and your family – and be able to show it to a friend or the community, even without sensitive details about exactly what you own and where.

What collectors say
Order in the collection
As an active collector, I finally wanted some order in my collection. In OutOfDark I see everything clearly in one place – charts, filters, coin previews – the kind of thing that used to take me hours in Excel. And my whole collection is now in my pocket 24/7: at coin fairs I no longer carry slips with the years I own, I just check my phone and can negotiate a purchase on the spot.
Monika B. active collector
Auction buying
I used to keep part of my collection in Excel, photos on my phone, and auction details scattered across emails. For the pricier coins I often had to dig back to find where I'd bought them, for how much, and what the description said. In OutOfDark I finally have every coin in one place – photos, price, notes, and provenance. What I appreciate most is that an auction link becomes the basis of a record without needless retyping.
Petr K. collector of Habsburg and Czechoslovak coins
Handing it to family
I've been building my collection for years, and over time I realized that what matters to me isn't just owning coins, but having them well documented. OutOfDark helped me get an overview of the whole collection – what I have, roughly what it's worth, and where the important notes are. I also like being able to prepare the collection so that someone in my family could find their way around it one day, if it were ever needed.
Jan M. long-time collector of historical coins
Our story

We're building the tool we needed ourselves

We're collectors and we love numismatics – among other things, we also run the numismatic e-shop Mincmistr.cz, so we have deep, long-standing experience with coins, auctions, and collecting. And yet for years our own coin information was scattered across Excel, Word, photos on our phones, auction links, invoices, and notes. The more the collection grew, the harder it was to quickly find out what exactly we had, what we paid for it, what it's worth, and why a particular piece is interesting.

We tried off-the-shelf solutions. Some were too generic, others were focused on the US market, and others felt outdated or cost too much for features we didn't need.

That's why we built OutOfDark. Not as another empty startup promise, but as a practical tool for everyday work with your collection. We don't chase flashy features – we mainly add what we genuinely use when working with our own collection.

First for us. Then for other collectors who finally want order in their collection. If this resonates with you, come join us.

Mirek & Zbyněk

Mirek and Zbyněk – founders of OutOfDark and Mincmistr s.r.o.

Try OutOfDark for free

Take your time and explore every feature. You've got 14 days to decide at your own pace – no pressure at all. And you can always stay on the free plan afterward.

By entering your email you agree to our privacy policy and terms of use.

  • No credit card
  • Only you can see your collection
  • Export your data anytime