Coin identifier app: what a photo can name, and what it can't

Yes, there are apps that name a coin from a photo, and on an unfamiliar foreign coin they do the job people actually want done. You photograph both sides and you get a country, a denomination, a series and roughly when it was struck, which is the part that used to mean an evening with a reference book and a lot of squinting. The two questions after that are harder: what condition the coin is in, and what somebody will pay for it. Those decide most of the price of any coin worth real money, and no app settles either one from a photo, ours included.

Buck is ours. It identifies coins and banknotes from a photo on iPhone (iOS 17 or later) and Android (8.0 or later), and there is no web version. Browsing the index and keeping a collection cost nothing, but scanning is what puts a coin into the collection, and it needs Buck Pro: $39.99 a year, or $5.99 a week if you only want it for one trip, which comes to about $311 if you leave it running (US stores, checked 21 September 2026). Both renew automatically until you cancel in your App Store or Google Play settings. There is no free trial. If you have one coin and one question, that is a lot of money for one answer.

How a coin identifier app works

You photograph one coin at a time, front first, then the back. The app compares what it sees against a catalog of coin and note types and hands back the closest match, with a price range where the price guide has one.

Plenty of coins share a design on one face and differ completely on the other, and the European Central Bank describes euro coins as having a common side plus a national side that "indicates the issuing country". A photo of the common side tells you the coin is a euro and nothing else.

In Buck a scanning session holds several coins, one per shot, with a running total, and the batch goes into your collection in one tap. If more than one coin is in the frame the app says "One coin at a time", which is what keeps a two-coin photo from being answered as though it were one coin.

Are coin identifier apps accurate?

At naming a coin they are better than most people expect, and at grading and pricing they are weak.

CoinWeek tested CoinSnap, a competitor of ours, on 15 coins in December 2023, 10 uncertified and 5 certified. Austin Purvis reported that the app "was able to accurately identify 14 out of the 15 coins provided, coming to 93% accuracy", and that on the five certified coins, the only ones in the test with a reference grade to check against, "only 40% were graded correctly". His warning about grading is worth keeping: the grade an app gives you "may be more of a reflection of your photography skills and/or the quality of your camera than the actual grade of the coin".

The American Numismatic Association's Reading Room reviewed the same app in November 2025 and landed on a similar split. Kevin Wang called the identification feature "excellent and the most useful aspect for numismatists", especially for foreign coins, while noting that results "can vary drastically depending on the lighting and quality of the photo" and that on price you should "treat the price as an estimate, as it is also by no means accurate".

That is their app. We measured ours on scans real people made, not on a shelf of coins we picked. On 288 random scans from real use (front and back, one per device, 7 to 15 September 2026, 82% from Italy, two thirds euro coins, 9 banknotes), country and denomination matched the label on 263 (91.3%), and the exact catalogue type on 219 of 281 (77.9%). The labels were read by two independent AI readers, with a third settling disagreements. That is our own check of our own app, not an outside test.

It is mostly euro coins, mostly from Italy, and nine banknotes in total. It says something about a handful of change from a European holiday and very little about an ancient coin, a US key date, or a worn silver piece with no legible date. When the read is unsure, or when the coin is described as gold and the record in front of it is a base metal coin, we decline to match at all.

How much is my foreign coin worth?

Usually face value. A handful of euro or sterling change from a trip is worth roughly what it says on it. The larger figures sit with money that is out of circulation, struck in small numbers, or unworn.

What you get from us is an estimate. On current euro and sterling cash it is always a range. Elsewhere it is a range where the price guide has one; about a quarter of priced types carry a single figure, and about one type in five has no price yet. It is never an offer to buy, and a photo cannot settle a coin's grade, which is the scale from worn to as-struck that moves most prices.

Two rules keep ordinary change from reading like a windfall. The first one is a floor. Current euro coins and notes, the UK's circulating decimal coins and Bank of England notes are never priced under their face value, because a coin you can hand over in a shop is worth at least what the shop takes it for.

The second one is a ceiling, on current euro and UK cash. A coin struck 20 million to 100 million times is capped at four times its face value, one struck 100 million times or more at twice face, and under 20 million the guide figure stands untouched. That cap binds on 79 of the 540 two-euro types we hold (counted 21 September 2026). It is a rule about mass-produced change and nothing wider.

The catalog is organized by type, so a mintage figure is the total across every year and every mint that struck it. We hold no per-year figures, which matters if your question is really about one date: that answer has to come from somewhere else.

What a photo cannot tell you

It cannot settle the grade. Wear is three-dimensional, read under angled light by somebody turning the coin in their fingers, and on a scarce piece the gap between two neighboring grades can be most of the value.

It cannot see whether the coin has been cleaned, which buyers and grading services check for and a phone camera at arm's length will not show you.

It cannot tell you the coin is genuine. The coins worth counterfeiting are exactly the ones people most want an app to confirm, and a convincing fake is built to survive being photographed.

It cannot rescue a worn date. If the year is soft, everything that depends on the year is guesswork, including anything we tell you about it.

For all four, the answer comes from someone holding the coin: a dealer across a counter, or a third-party grading service you mail it to. Use an app to find out what you have, then let a person decide what it is worth.

What this page is based on: CoinWeek's December 2023 test of CoinSnap by Austin Purvis, the American Numismatic Association Reading Room review of the same app by Kevin Wang from November 2025, the European Central Bank on the two sides of a euro coin, and our own check of 288 scans from 7 to 15 September 2026. Prices are US store prices, checked 21 September 2026.