CoinIdentifierApp tests coin identifier apps for collectors and casual finders who want actionable verdicts — not marketing claims about accuracy rates that vanish the moment you photograph a worn Buffalo nickel.
Who We Are
Two of us started this because we inherited a box of coins and downloaded five different identifier apps. Four of them confidently told us a Mercury dime was a Barber quarter. The fifth admitted uncertainty but gave us a range and three next steps: check the mint mark, look for wear patterns, consider professional grading. That app made a decision easier. The other four wasted our time. We realized the market doesn't compare these tools fairly — marketing says '99% accurate' everywhere, but the real story is in the edge cases.
We built this site to test identifier apps the way collectors actually use them: not with pristine, high-contrast coins under ideal lighting, but with the worn, foreign, and ambiguous coins people actually find in jars and attics. Our job is to show which apps tell you what to do next, and which ones just tell you what they think it is.
Methodology
We test each identifier app against the same standardized set of 25 coins. The set includes eight Lincoln wheat cents at various wear grades (1920 and 1944 common dates), three worn Buffalo nickels, four Mercury dimes spanning VF to AG, one Morgan dollar (1921 Peace), three foreign curveballs (Canadian quarter, British penny, pre-1965 US silver quarter), two modern proofs, and four edge cases (a cleaned cent, a damaged nickel, a coin with an unusual planchet, and one genuinely rare variety). We photograph each coin under consistent lighting, upload to the app, and record the response: identification, confidence level, time to result, and any warnings or next steps.
Our full test cycle takes eight to twelve weeks per app — we run three rounds per coin, verify results manually, and document failure modes. We evaluate each app across five criteria: accuracy on common coins; accuracy on worn coins (the real separator); confidence calibration (does a 87% certainty actually mean 87%); speed of response; and whether the app offers actionable next steps or just an identification. We re-test quarterly and after any major app update.
Our Standards
We believe a coin identifier app's job is to move you toward a decision: keep the coin, sell it, get it graded, or investigate further. An app that returns only a label — 'Lincoln cent, 1923' — is halfway done. An app that says 'Lincoln cent, 1923, but the mint mark is worn; compare against a 1923-D in VF grade before you assume common date' is actually useful. Most identifier apps stop at the label. The best ones admit what they're uncertain about and show you how to verify. We score heavily on this: an app that tells you 'I'm 76% confident this is a Mercury dime; check the obverse for the word LIBERTY if you can't see it clearly' ranks higher than an app claiming 94% confidence on the same worn coin. Honest uncertainty is an asset, not a liability. We also score on whether the app works fast (under three seconds per coin) and whether it handles wear, damage, and foreign coins without breaking.
Disclosure
We do not accept paid placement or sponsored reviews from app developers; every app we test is tested the same way, regardless of marketing budget. We do not score apps on how many varieties they claim to detect or how many coins are in their database; we score on whether they tell you what to do next when you hand them a worn coin. We do not test every coin identifier app on the market — there are too many, and many are abandoned or duplicate platforms — and we do not claim expertise in rare varieties, ancillary strikes, or non-US numismatics beyond our test set.
Contact
If you've found a coin identifier app worth testing, or if you think we should add a specific coin type to our test set, use the contact form on this site. App developers can request review there as well.