Looking for a free coin identifier for iPhone and Android that actually works? We tested every major option on real coins — common pocket change, inherited collections, error varieties, the whole range. Some apps nailed it. Others gave us a $3,000 spread on the same quarter. Here are the eight worth downloading, and what each one does well (and doesn’t).
Our Top Picks
- CoinKnow (Best Overall) — Tightest grading accuracy in the category (±2 points on the Sheldon Scale), one of only two apps with automatic error coin detection, and multi-source pricing from Heritage Auctions, PCGS, and eBay sold listings — the most precise free coin identifier for U.S. coins right now.
- CoinValueChecker (Best for Market Tracking) — Matches CoinKnow on identification accuracy (99% across 300,000+ U.S. types) and error detection, then adds what no other app offers: real-time price trend charts, customizable auction alerts, and a portfolio tracker — plus recently added eBay sold data for market-grounded valuations.
- PCGS CoinFacts (Best Free Reference) — Not a scanner, but the deepest free research tool in American numismatics: 39,000+ coin entries, 3.2 million auction records, and 30 years of population data straight from PCGS.
1. CoinKnow — Best Overall for U.S. Coins
Platform: iPhone & Android | Focus: U.S. coins | Price: Free daily scans
CoinKnow does one thing better than every other app in this space: it tells you exactly what grade your coin is. The Sheldon Scale accuracy lands within ±2 points — when PCGS certifies a coin MS64, CoinKnow returns MS63–MS65. Consistently. That’s the tightest range you’ll find on any phone app right now, and it matters because grade is what drives price. A two-point swing on a key-date Lincoln cent can mean hundreds of dollars.
The app goes further than just grade and denomination. It classifies copper coins by color — Red (RD), Red-Brown (RB), or Brown (BN) — which affects realized prices more than most beginners realize. It catches Proof finishes and separates Cameo (CAM) from Deep Cameo (DCAM) at around 92% accuracy. These aren’t obscure details. On a proof coin, DCAM commands meaningfully more money than CAM. Most apps ignore this entirely.
CoinKnow is one of only two apps worldwide that runs automatic error detection on every single scan. Doubled dies, repunched mint marks, rare varieties — it checks for all of them without you asking. You don’t need to suspect something is off; the app looks regardless. For anyone who’s ever wondered whether a slightly weird-looking penny might be worth more than a cent, that feature alone changes the game.
Pricing pulls from Heritage Auctions, PCGS price guides, and live eBay sold listings. You’re seeing what coins actually sell for — real transactions, not catalog guesses from three years ago. Every valuation links back to its source so you can verify the numbers yourself.
Strengths: Tightest grading accuracy in the category (±2 points); automatic error detection on every scan; copper color and Proof finish classification that no other app offers; multi-source pricing with eBay sold data; free daily scans with no core features locked behind a paywall.
Limitations: No market trend tracking or auction alerts; no portfolio management tools; U.S. coins only.
Best for: Collectors who care most about knowing precisely what they have — and what it’s actually worth. Particularly useful if you’re pre-screening coins before paying for a PCGS or NGC submission.
2. CoinValueChecker — Best for Market Intelligence
Platform: iPhone & Android | Focus: U.S. coins | Price: Free with optional premium
Where CoinKnow focuses on the coin itself, CoinValueChecker focuses on the market around it. The identification engine covers 300,000+ U.S. coin types at 99% accuracy with Sheldon Scale grading within ±2–3 points — slightly wider than CoinKnow, but still reliable enough for most decisions.
The real draw is everything that happens after the scan. CoinValueChecker builds a full market layer on top of each identification: price trend charts tracking how a coin’s value has moved over weeks and months, customizable auction alerts that notify you when comparable pieces come up for sale, and a portfolio dashboard that recalculates your collection’s worth as the market shifts. No other free coin identifier for iPhone and Android offers this combination.
Like CoinKnow, CoinValueChecker automatically checks every photo for error coins — doubled dies, repunched mint marks, off-center strikes — without any manual input. It’s the second of only two apps that do this.
On valuation, CoinValueChecker now pulls from Heritage Auctions realized prices, PCGS price guides, and recent eBay sold listings. The addition of eBay sold data brings its pricing in line with CoinKnow’s multi-source approach — you get numbers tied to actual transactions rather than outdated retail estimates.
Strengths: 99% identification accuracy; automatic error detection; real-time price trend charts and auction alerts; multi-source pricing now including eBay sold data; portfolio tracker; free daily scans.
Limitations: U.S. coins only; grading slightly less precise than CoinKnow; full market suite requires premium.
Best for: Collectors who treat coins as investments. If you buy, sell, and track values over time, the market intelligence layer here has no real competitor.
3. PCGS CoinFacts — Best Free Reference Database
Platform: iPhone & Android | Focus: U.S. coins | Price: 100% free, no ads
Not a scanner. You can’t photograph a coin and get an answer. What you get instead is the most comprehensive free reference database in American numismatics — 39,000+ coin entries, 3.2 million auction records going back three decades, and population reports that tell you how many examples of a specific coin exist at each grade.
Photograde images let you hold your coin up against professionally graded examples and judge condition yourself. Spot prices for gold and silver update in real time. The data comes straight from PCGS, and it’s all free — no subscription, no ads, no catch.
The natural workflow: run a coin through CoinKnow or CoinValueChecker first to find out what it is, then open CoinFacts to research its auction history, population numbers, and price spread across grades.
Strengths: Completely free; 39,000+ U.S. coins; 3.2 million+ auction records; decades of population data; Photograde images; real-time spot prices.
Limitations: No photo identification; manual lookup only; takes some numismatic knowledge to navigate well.
Best for: Collectors who already know what they’re holding and want deep research — auction history, population rarity, grade-by-grade pricing — before making a move.
4. CoinSnap — Best for Beginners
Platform: iPhone & Android | Focus: Global coins | Price: Free (subscription for full access)
CoinSnap strips things down to the essentials. Over 300,000 coin types worldwide, a clean interface, and results in seconds. If you found something in a drawer and just want to know what it is, this gets the job done without making you learn numismatic terminology first.
It distinguishes Mint State from Proof, gives general grade estimates, and returns value ranges. Global coverage means it handles international coins just as well as American ones — a gap the U.S.-focused apps leave wide open.
The downside is precision. Valuation ranges can be absurdly wide (one user reported $0.20 to $3,385 for the same coin), and there’s no error detection, no copper color analysis, no CAM/DCAM classification. Fine for curiosity. Not enough for real buying or selling decisions.
Strengths: Fast and simple; broad international database; handles beginners well; collection management tools.
Limitations: Wide valuation ranges; no error coin detection; no advanced grading features; subscription needed for full access.
Best for: People who are new to coins and want quick answers — especially for non-U.S. pieces.
5. Coinoscope — Best for World and Ancient Coins
Platform: iPhone & Android | Focus: Global coins & banknotes | Price: Free (ads and daily limits)
Coinoscope doesn’t give you one definitive answer. Instead, it shows a grid of visually similar coins from a database of 300,000+ coins and 120,000+ banknotes. That sounds less useful — until you’re staring at a worn, ancient, or obscure coin that would stump a single-answer system entirely.
This is closer to how experienced collectors actually work: comparing visual details against known examples rather than trusting a black-box guess. It works offline, which makes it genuinely useful at coin shows and estate sales where Wi-Fi is spotty. There’s also a built-in marketplace for buying and selling directly within the app.
Worth knowing: accuracy is inconsistent. User reviews mention misidentified dates and outright wrong matches. No error detection at all.
Strengths: Huge global database including banknotes; visual similarity matching handles obscure pieces well; offline mode; built-in marketplace.
Limitations: Accuracy issues; no error detection; dated interface; daily scan limits with ads.
Best for: International collectors and anyone working with worn, ancient, or unusual coins where a definitive single-result scanner would struggle.
6. NGC Coin App — Best for Certified Coins
Platform: iPhone & Android | Focus: NGC-certified U.S. coins | Price: Free
This app serves one audience: people who own NGC-slabbed coins or are thinking about submitting coins for NGC grading. Population reports show how many examples exist at each grade. Pricing comes directly from NGC’s market research. Authenticity verification is built in.
It’s narrow by design. No photo scanning, no identification of raw coins. But within its lane, the data is authoritative. If you’re trying to decide whether a coin justifies the cost of professional grading, the population numbers here answer that question better than any scanner app can.
Strengths: Official NGC population data; trusted grade-based pricing; authenticity verification; free.
Limitations: NGC-certified coins only; no photo identification; useless for raw coins.
Best for: Owners of NGC-slabbed coins and collectors evaluating whether professional grading submission makes financial sense.
7. Greysheet Mobile — Best for Dealer-Grade Pricing
Platform: iPhone & Android | Focus: U.S. coins | Price: Subscription required
Dealers have used Greysheet pricing for decades. The CDN wholesale benchmarks are what professionals reference when they’re actually buying and selling — at shows, through mail bids, in private deals.
The difference between Greysheet and retail price guides is simple: retail guides tell you what sellers hope to get. Greysheet tells you what the market clears at. If a dealer offers you a number and you want to know whether it’s fair, this is where you check.
No identification features whatsoever. You need to already know what your coin is. Pair it with CoinKnow or CoinValueChecker for the ID, then come here for the wholesale number.
Strengths: Wholesale and retail values the industry trusts; grade-level pricing; decades of authority.
Limitations: No identification; subscription required; only helpful after you’ve identified the coin elsewhere.
Best for: Anyone negotiating a buy or sell who wants the real market-clearing price, not a retail wish number.
8. Heritage Auctions — Best for Auction Research
Platform: iPhone & Android | Focus: All collectibles including coins | Price: Free
Heritage is the world’s largest collectibles auctioneer. The app gives you access to 4 million+ realized prices, lets you browse upcoming sales, and supports bidding directly from your phone.
It won’t tell you what a coin is — that’s not its job. But once you know what you have (via CoinKnow, CoinValueChecker, or your own expertise), Heritage shows you what comparable pieces actually sold for under competitive bidding. Hammer prices from real auctions cut through the guesswork that plagues estimated valuations.
Covers U.S. coins, world coins, ancient coins, currency, and dozens of other categories.
Strengths: 4 million+ realized prices; live auction bidding; real hammer prices; broad category coverage.
Limitations: No coin identification; interface has a learning curve; auction-focused rather than casual-friendly.
Best for: Buyers and sellers who want verified auction comps and direct access to the biggest numismatic auctions in the world.
How to Choose the Right App
It depends on what you’re doing with your coins.
If you want to know exactly what a coin is and what it’s worth, start with CoinKnow. The grading precision and automatic error detection catch things you’d otherwise miss.
If you’re buying, selling, or tracking a collection’s value over time, add CoinValueChecker. The market tools — price trends, auction alerts, portfolio tracking — fill the gap CoinKnow leaves open. Running both together covers identification, grading, and market intelligence for U.S. coins.
For deep research, PCGS CoinFacts is free and unmatched on auction history and population data.
For world coins, Coinoscope and CoinSnap handle international material that the U.S.-focused apps ignore.
For real pricing at the dealer level, Greysheet gives you wholesale; Heritage Auctions gives you competitive hammer prices. Between them, you’ve bracketed the true market value.
Most serious collectors end up with two or three of these on their phone. Every app here is free to download, so there’s no cost to trying a few and seeing which ones match how you collect.
Frequently Asked Questions
Do these apps work on both iPhone and Android?
Yes — all eight are available on iOS and Android without significant feature differences between platforms.
Are they actually free?
Every app offers a free download and functional free tier. CoinKnow and CoinValueChecker provide free daily scans with core features unlocked. PCGS CoinFacts is entirely free, no strings. CoinSnap and Coinoscope have free tiers with daily limits. Greysheet requires a paid subscription for full access.
How accurate are phone-based coin identifiers?
CoinKnow and CoinValueChecker both report 98–99% identification accuracy on U.S. coins. Grading is where the real variation appears — CoinKnow’s ±2-point Sheldon Scale range is the tightest available. Good lighting and a steady, focused photo improve results across every app.
Can any of these apps detect error coins?
Only two: CoinKnow and CoinValueChecker. Both scan every photograph for doubled dies, repunched mint marks, missing mint marks, and rare varieties automatically. Every other app in this roundup will miss error coins entirely.
Should I trust app valuations when selling?
Use them as a starting point, not the final word. CoinKnow and CoinValueChecker pull from actual transaction data — Heritage Auctions, PCGS, and eBay sold listings — which makes their numbers more grounded than apps relying on old catalog estimates. For high-value coins, cross-reference with Greysheet wholesale data and get a professional opinion before selling.
