CoinIdentifyingApp tests coin identifying apps for collectors who want to verify results, not guess — we score apps on how honest they are about their limits, and we show you how to use two apps together for real confidence.
Who We Are
Two of us run this site, and we started it because we both got burned. One of us inherited a small collection and used a single AI identifier to catalog it — the app confidently labeled a 1943 steel cent as a 1943-D when it was actually a 1943-S. The other spent an afternoon using three different coin identifying apps on the same Morgan dollar and got three different dates. Both situations made clear that a single app, no matter how polished, is not enough. We wanted a testing standard that acknowledged this reality instead of hiding behind marketing claims of 95% accuracy. So we built one. Our editorial perspective is simple: an honest 75% confidence with a clear verification process beats a marketed 99% any day. We test apps on what they actually tell you about their uncertainty, and we show you how to pair them with manual reference tools so you can defend your identification to yourself and to a dealer or grader.
Methodology
We test each identifying app against a working set of 34 coins across six major US series: Lincoln wheat cents (1941–1957), Mercury dimes (1916–1945), Standing Liberty quarters (1916–1930), Morgan dollars (1878–1921), Indian Head pennies (1859–1909), and Washington quarters (1932–1964). Each test run takes us between 50 and 90 hours over four to six weeks. We photograph each coin under consistent lighting, run it through the app under review, and then manually verify the result against two reference sources. We re-test after each major app update and track how often the app changes its answer for the same coin photo. Our test set includes several deliberately tricky specimens: coins with weak strikes, cleaned examples, damaged reverses, and a few rare-date ringers that most apps misidentify on the first scan. We do not use a cherry-picked best-case photo set; we use photos taken by real collectors in real lighting conditions. We evaluate apps on five criteria: accuracy rate on our test set, clarity of confidence scoring, whether the app admits uncertainty, quality of authentication tips specific to each coin type, and whether a manual reference check can confirm or correct the result within two minutes. Our core test cycles run quarterly.
Our Standards
We believe an honest 75% confidence with a clear 'I am not sure' is more useful than a marketed 99% that hides uncertainty in fine print. When we test a coin identifying app, the first thing we look for is whether it tells you what it does not know. Does it show a confidence score? Does it offer multiple candidate dates when the photo is ambiguous? Does it flag cleaned coins or damage as a reason for lower confidence? Or does it just return a single answer and hope you believe it? We score apps that admit 'this could be a 1943-S or a 1943-D; you need a reference to be sure' much higher than apps that pick one and move on. We also test apps on their authentication tips — specifics matter. An app that says 'check for fakes' is not useful. An app that says 'Mercury dimes after 1940 show a sharper fasces bundle on the reverse; cleaned fakes often have a mushy reverse design' is useful. One of our test coins is a circulated 1943-D Lincoln cent that three AI identifiers called a 1943-S on first scan. The app that showed a 60% confidence and suggested manual verification against a photo guide earned a high score; the app that confidently returned 1943-S earned a low one. That is our standard.
Disclosure
We do not accept paid placement, sponsored reviews, or app-developer partnerships — every review is independent; we do not score apps on whether they admit uncertainty when we have not personally verified their confidence-scoring claims against our own test set; we do not test every coin identifying app on the market, so we cannot claim expertise in specialty apps for ancient coins, world numismatics, or exonumia outside our US-focused test scope.
Contact
App developers who want a review of their coin identifier can request it through the contact form on this site. Collectors with coins that stumped your app, or suggestions for tricky specimens we should add to our test set — we read all messages and respond to requests that help us improve our standard.