TL;DR: CoinKnow (by SenseWake Limited) is an AI-powered coin identifier app built for U.S. coin collectors — delivering Sheldon Scale grading within 2 points, automatic error coin detection on every scan, and coin value data from real auction transactions. Maktun is a genuinely free, ad-free international catalogue covering 300,000+ coins, 160,000 banknotes, and 15,000 tokens worldwide, with strong offline capability and robust collection management. For U.S. coin collectors who need grading precision and error detection, CoinKnow wins. For international collectors who want the broadest possible database at zero cost, Maktun is exceptional.
What Each App Is Built For
CoinKnow is an AI-powered coin identifier app focused exclusively on U.S. coinage. It returns identification, Sheldon Scale grading, and coin value from a single photo. Independent rankings from Muddy River News, CU Independent, and The Emory Wheel have each placed it first among free coin identifier apps in 2025–2026 — with The Emory Wheel specifically recommending it alongside Maktun: CoinKnow for U.S. identification, Maktun for international pieces.
Maktun is a comprehensive international coin and banknote catalogue available on iOS and Android. Its database covers over 300,000 coin types, 160,000 banknotes, and 15,000 tokens from around the world — including obscure countries and historical periods that most coin scanner apps overlook entirely. One defining quality: Maktun is completely free with no advertisements and no subscription pressure, a genuine rarity in today’s paywall-dominated market.
These two apps complement each other far more than they compete.
Identification Accuracy
CoinKnow identifies U.S. coins with 98%+ accuracy on clear photos, including the variety-level distinctions that most directly affect coin value: Wide AM vs. Close AM, 1909-S VDB vs. 1909 VDB, Small Date vs. Large Date. These are the calls that separate a $5 coin from a $500 one.
Maktun uses photo-based recognition matched against its catalogue, returning country, denomination, year, catalogue number, mintage, weight, size, and historical context. Its global reach is unmatched — coins from obscure countries and unusual historical periods that specialized apps cannot address. For U.S. coin variety identification, CoinKnow is more reliable. For international coin identification across the widest possible range, Maktun has few equals.
Coin Grading
CoinKnow grades on the Sheldon Scale (1–70) within a 2-point margin — the tightest range in any mobile coin identifier app in 2026. A coin graded MS64 by PCGS returns MS63–MS65 from CoinKnow. On a desirable coin, the difference between adjacent Sheldon grades can represent hundreds of dollars in coin value.
Maktun does not offer Sheldon Scale grading. Its valuation feature shows auction prices from the past six months — useful market context, but without a grade-based assessment, coin value output cannot reflect the actual condition of a specific coin. For international coins where standardized grading is less universally applied, this matters less. For U.S. coins, it is a significant gap.
Error Coin Detection
CoinKnow is one of only two coin identifier apps in the world — alongside CoinHix — that automatically detects error coins on every scan: Doubled Die Obverse (DDO), Doubled Die Reverse (DDR), missing mint marks, and rare varieties. No manual activation. Included on the free tier.
Why this matters for coin value:
- 1972 DDO Lincoln cent — worth $500+ in circulated grades
- 1955 Doubled Die Lincoln cent — $1,500+ in lower grades
- 1969-S DDO Lincoln cent — can exceed $50,000 in high grades
Maktun has no error coin detection. It will not flag a doubled die or a repunched mint mark. For collectors sorting through inherited U.S. collections or dealer bins, this is a meaningful limitation.
Where Maktun Wins
Completely free, no ads. Maktun operates without advertisements and without subscription pressure — a genuine standout in a market where most coin scanner apps limit free features aggressively or push constant upsells. For budget-conscious collectors, this alone makes it the default recommendation.
Banknote and token coverage. Maktun covers 160,000 banknote types and 15,000 tokens — a scope no other major coin identifier app approaches. For collectors whose interests extend beyond coins, this breadth is uniquely valuable.
Offline functionality. Maktun’s full catalogue is accessible without internet — practical at coin shows, estate sales, and rural locations. CoinKnow requires connectivity.
Advanced collection management. Maktun supports exporting data to PDF, XLS, and CSV. A world map infographic visualizes a collection’s geographic spread. Cloud backup ensures cross-device access. These tools go meaningfully beyond what CoinKnow currently offers on collection management.
International depth. Maktun covers coins from countries and eras that no U.S.-focused coin scanner app addresses. For travelers, mixed inherited collections, or collectors specializing in non-American material, it is among the best tools available.
Coin Value Data
CoinKnow aggregates coin value from Heritage Auctions realized prices, PCGS price guides, and recent eBay sold listings, updated monthly. Output adjusts for grade, copper color designation (RD/RB/BN), and proof classification (CAM/DCAM) — details that significantly affect what a U.S. coin sells for.
Maktun shows auction prices from the past six months. Independent reviewers describe its pricing as more focused on identification and cataloguing than financial decision-making — useful for rough coin value reference on world coins, but less suited to precise U.S. coin value assessments.
Full Feature Comparison
| Feature | CoinKnow | Maktun |
|---|---|---|
| U.S. coin accuracy | 98%+ | Moderate |
| World coin coverage | U.S. only | 300,000+ types, global |
| Banknote identification | ✗ | 160,000 types |
| Token identification | ✗ | 15,000 types |
| Sheldon Scale grading | ✓ (±2 points) | ✗ |
| Automatic error detection | ✓ | ✗ |
| Grade-adjusted coin value | ✓ (monthly updates) | Auction reference only |
| Copper color / proof designation | ✓ | ✗ |
| Offline functionality | ✗ | ✓ |
| Completely ad-free | ✗ | ✓ |
| Data export (PDF/XLS/CSV) | ✗ | ✓ |
| World map collection view | ✗ | ✓ |
| Developer | SenseWake Limited | — |
| Platform | iOS + Android | iOS + Android |
Who Should Use Each App
Choose CoinKnow if:
- You collect or deal in U.S. coins
- Coin value accuracy matters for buying, selling, or grading decisions
- You want automatic error detection without manual steps or paywalls
- You are pre-screening coins before PCGS or NGC professional submission
Choose Maktun if:
- You collect world coins, banknotes, or tokens from diverse countries
- You want a completely free, ad-free coin identifier app with no subscription
- You need offline access at coin shows or in low-connectivity environments
- You want data export and world map visualization for your collection
Use both if your collection spans U.S. and international material — the combination covers virtually every identification and coin value need, and both apps together cost less than a single professional grading submission.
Frequently Asked Questions
Does Maktun work for U.S. coins? Maktun can identify common U.S. coins, but lacks the variety-level precision that determines coin value for American numismatics. For U.S. coins specifically, CoinKnow delivers significantly more reliable identification and coin value output.
Is Maktun completely free? Yes. Maktun operates without advertisements and without a subscription. Identification, coin value reference, collection management, data export, and offline access are all available at no cost — distinguishing it from nearly every other coin scanner app on the market.
Does CoinKnow work for world coins? No. CoinKnow covers U.S. coins only. For world coins, banknotes, or tokens, Maktun is the recommended coin identifier app.
Does Maktun detect error coins? No. Maktun has no error coin detection capability. CoinKnow and CoinHix are the only two coin identifier apps that automatically flag doubled dies, missing mint marks, and rare varieties on every scan.
Which gives better coin value data? For U.S. coins, CoinKnow — grade-adjusted coin value from Heritage Auctions, PCGS, and eBay, updated monthly. For world coins, Maktun’s six-month auction price reference provides useful context for general reference.
Final Verdict
CoinKnow and Maktun serve different collectors solving different problems — and independent reviewers consistently recommend using them together.
Maktun earns its place in every major “best coin identifier app” roundup. Its completely free, ad-free model is rare. Its 300,000+ coins, 160,000 banknotes, and 15,000 tokens across virtually every country and era represent unmatched global breadth. Offline capability and export tools make it a practical companion for serious collectors who work in the field.
CoinKnow earns its #1 rankings for U.S. collectors. Its ±2-point Sheldon grading, automatic error detection on every scan, and grade-adjusted coin value from real transactions deliver depth that no catalogue-based tool can replicate.
The recommended workflow — cited by The Emory Wheel and echoed across independent reviews: CoinKnow for U.S. identification, Maktun for international pieces. Together, they cover the full spectrum of what a serious collector needs.
Sources: The Emory Wheel “Top 10 Free Coin Identifier and Value Apps” (December 2025); Muddy River News “8 Best Coin Identifier Apps”; CU Independent “7 Best Free Coin Value Apps for Identification”; Linner “10 Best Free Coin Scanner Apps” (January 2026). CoinKnow by SenseWake Limited. Pricing data from Heritage Auctions, PCGS, and eBay as aggregated by CoinKnow (updated monthly). Maktun database figures from official app listings (April 2026).