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Challenge coin collectionA challenge coin is worth almost nothing and means almost everything. The value is not the metal. It is the person who put it in your hand, and that part lives in one memory until it doesn't. Muster writes it down.
Free · iPhone and any browser · No ads


A coin is a two-sided object, and most apps save one picture and throw away half the artwork. Muster keeps the obverse and the reverse, on a rack you can search by unit, by the person who gave it to you, or by the place you were standing.

Unit. Date earned. Location. Presented by. Notes. The five things you will want to reread in twenty years, on ruled lines like a field record. Half-remembered dates are fine: enter the year if that is all you have, and Muster never invents the day.

Sort the collection by the date earned and it reads like the career it is. The stats count your units and your branches, and tell you plainly which coins are still missing their story.

Just got handed one? Photograph both faces, type the unit, done. The story can be written tonight. Wishlist the ones you are still hunting, and tick them off the day they arrive.

One link shows your collection with the stories, formatted like a page from the guide, and you can rotate it any time. Estimated values and serial numbers never appear on it. They leave the app in exactly one place: your own export, for insurance or for whoever inherits the collection.

Obverse and reverse, always. Half the artwork is on the back.
One is in your pocket. Muster knows which, for the coin check.
The coins you are still hunting, ticked off the day they arrive.
One link shows the rack and the stories. Rotate it any time.
A full spreadsheet with values and serials, for insurance or estate.
Units, branches, and which coins still have no notes.
By unit, by the person who gave it to you, by the place.
No feed, no followers, no shared coin database. Your coins are yours.
Made for the people who earned them, not the people who trade them.
Free on iPhone and on the web. No account tricks, no upsell. If it earns its keep, you can buy the developer a pop.