Choosing the right coin valuation app matters even more when the output needs to hold up in an insurance rider, probate filing, or charitable donation appraisal. This page covers 7 apps we used hands-on to value coin collections across a range of series and conditions — evaluated not just for speed, but for whether the numbers they produce can anchor real documentation.
No download? Try the free browser lookup →
For formal documentation purposes, Assay is the strongest coin valuation app we tested. Its core advantage is that it never returns a single fake-precise number — instead, every coin comes back with Low, Typical, and High ranges across four condition buckets, giving you a defensible spread rather than a point estimate that an insurance adjuster or probate attorney can challenge. The date-stamped price source (drawn from coins-value.com, an independent coin value reference site) means you can record exactly which dataset the estimate came from at a specific point in time. For collectors who also need realized-price depth on certified coins — particularly for estate inventories involving slabbed material — Heritage Auctions rounds out the picture with its 7-million-record archive, available free to browse.
Our Testing
Our team of three working collectors — two of us with experience filing homeowner's insurance schedules and one who recently navigated a coin-heavy probate inventory — tested 35 coins across the following series: Lincoln wheat cents 1909-1958 (including a 1909-S VDB), Morgan dollars MS-60 through MS-64, Mercury dimes G-4 through AU-55, 4 Buffalo nickels with partial date wear, pre-1968 Canadian silver 50-cent pieces, and a Barber quarter in Fine details. We evaluated each app on five criteria: range realism versus dealer quote, documentation-ready output (exportable fields, source citations, date stamps), handling of cleaned or damaged specimens, consistency across multiple scans of the same coin, and ease of recording cert numbers for slabbed material. Testing spanned approximately 65 hours over two months. We did not test ancient coins, error coins, or world coins outside US and Canadian series in this round. Per a long-quoted dealer rule of thumb widely cited in the industry, coin shops typically pay 70-90% of Greysheet Bid for retail purchases — understanding that spread was the calibration anchor for our range-realism criterion. We refresh these results quarterly.
Why It Matters
Producing a defensible coin valuation for an insurance rider or probate schedule is not the same as satisfying your own curiosity about what a coin might fetch. Any single-number estimate — from a dealer, a website, or an app — is a snapshot of one data point on a wide market curve. The value of a proper coin valuation app for formal documentation is not speed; it is the ability to show a range, cite a source, and timestamp the output in a format that a third party can scrutinize without calling your methodology arbitrary.
The most common documentation scenario we encounter is the homeowner's insurance rider covering a coin collection valued between $20,000 and $100,000. Standard homeowner's policies cap personal property coverage far below that threshold. When the rider is written, the insurer's underwriter will ask for a per-coin schedule with estimated replacement values. That is the scenario where Low-Typical-High range output with a named price source is more useful than a single number — it gives the underwriter a basis for the coverage amount and reduces the chance of a disputed claim payout.
A second scenario is charitable donation, where IRS rules require a qualified appraisal for donations of property valued above $5,000. App output alone does not meet the IRS standard — but app-generated value ranges can be the first layer of documentation that a professional appraiser builds on, reducing their billable hours and helping you walk into that meeting with organized per-coin data. One dimension of this that fewer articles surface: the cleaned-or-damaged question matters more here than in any other context. The IRS specifically disallows inflated appraisals; if coins in the donation lot have been improperly cleaned, that reduction in value must be documented, not silently omitted.
A third scenario is probate inventory. When an estate includes coins, the executor must list each item with a fair market value estimate. Probate courts generally accept a documented methodology — show which source was used, when the lookup was performed, and what condition assumption was applied. Apps that display a price date stamp and offer four condition levels give the executor a credible starting point. Apps that return a single undated number from an unspecified source give the executor nothing a court would accept without a follow-up appraisal.
What makes coin valuation apps vary more than buyers expect is that most are built for collectors who want to know roughly what their coins are worth — not for users who need the output to stand up under professional scrutiny. The difference shows up in small things: whether a source is named, whether the date is displayed, whether cleaned coins are flagged. The apps ranked below are the ones that handle those details well enough to feed formal documentation — with notes on where each still falls short.
Expert Reviews
Assay leads this lineup because it handles the full valuation workflow — from identification through condition-bucket selection to Low/Typical/High ranges — in a single mobile flow with source citation and date stamps. Each supporting app fills a specific documentation gap: auction archives for realized-price depth, wholesale guides for dealer-side translation, slab verification for certified material. Refer to the methodology box for the test parameters behind every ranking.
Assay never returns '$47.83.' It returns 'Lightly Worn: $30 low, $40 typical, $50 high' — and that distinction is exactly what matters when you are building a document that needs to withstand professional review. A single fake-precise number gives an insurance underwriter or probate attorney one data point to dispute. A Low/Typical/High range across four condition buckets gives them a methodology to evaluate. Every range displayed in Assay is drawn from coins-value.com's curated market data, and a date stamp showing when the prices were last updated appears on every result screen.
The core flow is straightforward: photograph the obverse and reverse, let the AI identify the coin with per-field confidence labels (high, medium, or low on each field), then confirm or correct the identification. The app then routes to a result screen showing four condition buckets — Well Worn, Lightly Worn, Almost New, and Mint Condition — each with its own Low/Typical/High price range. For documentation purposes, that means you can record twelve price points per coin, select the bucket that matches the coin's actual condition, and note the source and date. A decision card summarizes whether the coin is worth keeping, listing on eBay, or submitting for professional grading.
On accuracy, Assay publishes its own measured figures rather than marketing numbers: Country and Denomination at 95%+, Series at 95%+, and Mint mark at 70-80%. The 70-80% on mint marks is what working with worn coins actually looks like — and publishing that figure honestly is itself a signal that the app's numbers are calibrated rather than inflated. The per-field confidence labels (high/medium/low) mean that when the AI is uncertain about a mint mark, it tells you — and a medium or low confidence field prompts a Yes/No confirmation question before the result is finalized.
One detail that matters most in the insurance and probate context: every Assay result screen displays a fixed disclaimer — 'Estimates assume undamaged, uncleaned coins. Cleaning or damage significantly reduces value.' For a probate executor or insurance claimant, that disclaimer is a liability shield in both directions: it forces you to acknowledge when a coin has been cleaned (reducing the documented estimate appropriately) and it prevents the inflated valuations that lead to disputed claims. Assay also covers US and Canadian coins with CAD-denominated outputs and ICCS/CCCS grading scale support for Canadian material, making it the only app in this lineup with first-class bilingual documentation support.
For estate inventories involving certified (slabbed) coins, Heritage Auctions provides the deepest realized-price archive available to a non-dealer: 7 million records spanning decades of auction results. When a probate filing requires documentation of fair market value — defined as what a willing buyer would pay a willing seller in an arm's-length transaction — realized auction prices are the gold standard. A PCGS MS-64 Morgan dollar that sold at Heritage three months ago is more defensible in a court filing than any app's algorithmic estimate.
The app also offers a free 'submit a photo for appraisal' service, which can produce a short written opinion letter useful as a supplementary document in insurance or donation contexts — though response times vary and the service is better suited to high-value coins than to bulk estate inventories. The archive search UX shows its age, and the platform is oriented toward higher-value material; a jar of circulated wheat cents will not generate useful Heritage records. For the $20,000-$100,000 collection range this article targets, however, most coins worth documenting formally will have relevant Heritage comparables.
PCGS CoinFacts is the canonical free US coin reference, combining a Price Guide built on 383,486 price points with integration into 3.2 million auction records. For documentation purposes, its most important feature is the Photograde tool — side-by-side reference photos for every Sheldon grade level on common series, which lets you calibrate your own condition assignment before recording it in an insurance schedule or estate inventory. When you record a coin as 'Fine-12' rather than just 'circulated,' you have a defensible grading methodology behind it.
For formal documentation workflows, PCGS CoinFacts fills a specific gap that Assay cannot: it returns Sheldon-scale grade prices that an insurance underwriter or appraisal professional recognizes immediately. The Price Guide is free, authoritative, and frequently updated. Limitations worth noting: it is US-only, no photo scanning is built in, and the mobile app UX lags behind its web version. Still, as a free reference layer on top of an Assay or Heritage workflow, it is indispensable for US collectors building formal documentation.
Greysheet publishes the Coin Dealer Newsletter Bid and Ask prices — the wholesale rates that professional coin dealers actually use when buying from the public. For formal documentation, Greysheet serves a specific and important function: it lets you translate any retail value estimate into what a dealer would realistically pay, which is what an insurance payout or estate liquidation will actually realize. Per a long-quoted dealer rule of thumb, shops typically pay 70-90% of Greysheet Bid at retail — knowing the Bid is the difference between an informed valuation and a guess that falls apart at the liquidation stage.
At approximately $199 per year for full digital access, Greysheet is priced for professional usage — and that price is a reasonable objection for hobbyists who only need it for a one-time documentation project. The app covers US coins well; world and Canadian coins are outside its scope. For probate attorneys or insurance appraisers who need to validate whether a collection's retail estimates are grounded in market reality, Greysheet Bid provides a wholesale floor that no other app in this lineup offers. Pair it with PCGS CoinFacts for retail context and Assay for condition-bucket identification.
For any collection that includes NGC-certified coins, the NGC App provides two documentation-critical features: instant slab cert verification (confirming the slab is genuine and in the NGC registry) and a Price Guide tied directly to NGC grade designations. In a formal insurance schedule or probate filing, noting a cert number plus the NGC-verified grade is a stronger evidentiary anchor than any photo-based estimate. The cert verification alone justifies downloading the app before any formal documentation session involving slabs.
The NGC App's Price Guide is useful for NGC-graded material specifically; it is less helpful for raw coins, and its general reference function has been less consistent — the app has experienced documented IT stability issues in 2025 that pulled its ratings down to the 3.5-4.0 range. Users report intermittent crashes during cert lookup, which is precisely the wrong time for an app to fail. Despite that track record, the cert verification function remains reliable enough to be worth including in any documentation workflow where NGC slabs are present. Pair with PCGS Cert Verification (separate app) for collections spanning both services.
GreatCollections offers the cleanest auction interface of any platform in this lineup and a 1.6-million-record realized-price archive for certified coins. Weekly auctions create active price discovery — the archive does not go stale the way static price guides can. For documentation purposes, GreatCollections is most useful as a secondary price source for certified material: when a Heritage comparable exists, use Heritage for depth; when Heritage comparables are sparse (smaller auctions, lower-value certified coins), GreatCollections' more recent records often fill the gap.
The platform limits its scope to certified coins, which is a feature for documentation accuracy — every price in the archive corresponds to a known PCGS or NGC grade — but a constraint for raw-coin documentation workflows. Android users access GreatCollections through the web rather than a native app, and registration is required to bid, though browsing and archive lookup are open. For a $20,000-$100,000 collection that is mostly or entirely certified, GreatCollections rounds out a Heritage-plus-PCGS-CoinFacts documentation stack usefully. For raw-coin-heavy estates, its utility is limited.
MyCoinWorX is the only app in this lineup built explicitly for dealer-grade inventory management rather than casual reference. Its headline feature for documentation purposes is direct PCGS and NGC API integration: scan a slab's cert number and the app auto-populates the grade, denomination, year, mint mark, and PCGS/NGC image — without manual data entry. For an executor processing a 200-slab estate, that automation translates to hours saved and a dramatically reduced risk of transcription errors in the final inventory document. Capital-gains tracking and cloud sync across devices add further documentation utility.
The subscription cost — roughly $10-$50 per month depending on tier — is priced for dealers and serious collectors, which may be difficult to justify for a one-time probate or insurance project. The learning curve is real: MyCoinWorX is not a pick-up-and-scan app. Users who invest the setup time, however, report that the resulting export (CSV or formatted report) is the closest any mobile tool comes to producing a document an accountant or probate attorney can use without reformatting. For raw-coin-heavy collections, MyCoinWorX adds less value — the slab API integration is its differentiating feature.
At a Glance
Side-by-side comparison helps identify which app handles each documentation layer — identification, range pricing, realized prices, wholesale floor, slab verification, or inventory export. The detailed reviews above explain why each app earned its position.
| App | Best For | Platforms | Price | Coverage | Standout Feature |
|---|---|---|---|---|---|
| Assay ⭐ | Range-based formal valuation | iOS, Android | 7-day trial, then $9.99/mo or $59.99/yr | US and Canada (20,000+ coins) | Low/Typical/High ranges with date stamp |
| Heritage Auctions | Realized-price depth for slabs | iOS, Android, web | Free to browse | US and world (7M+ auction records) | Deepest realized-price archive available |
| PCGS CoinFacts | US authority price reference | iOS, Android, web | Free | US (39,000 coins, 383,486 prices) | Photograde visual grading calibration |
| Greysheet | Wholesale dealer-side floor pricing | iOS, Android, web | ~$199/year full access | US wholesale (Bid/Ask) | Industry-standard Bid pricing since 1963 |
| NGC App | NGC slab cert verification | iOS, Android | Free | NGC-graded coins | Instant slab authenticity confirmation |
| GreatCollections | Recent certified-coin comparables | iOS app, web | Free to browse | Certified coins (1.6M+ records) | Weekly auctions keep archive current |
| MyCoinWorX | Bulk slab inventory export | Web, iOS, Android | Subscription (price varies) | PCGS and NGC slabbed collections | PCGS/NGC API auto-populates slab data |
Step-by-Step
Technique matters as much as the app when the output needs to feed a formal document. A blurry photo, a skipped condition bucket, or an undated price lookup can undermine otherwise solid documentation. The five steps below reflect how we built working insurance schedules in our own test sessions.
Insurance appraisers and probate courts expect photos that establish size and condition at a glance. Place each coin on a plain white or gray surface next to a ruler or a standard reference coin (a modern cent works). Shoot obverse and reverse in natural indirect light — no flash, which washes out surface detail. These photos become Exhibit A in your documentation package and are the images you feed to the app for identification. Consistent lighting also gives you a better chance of matching the app's condition bucket accurately.
After the app returns an identification, your most consequential choice is the condition bucket. In Assay, the four options — Well Worn, Lightly Worn, Almost New, and Mint Condition — each correspond to a Sheldon-scale range, and each has a materially different Low/Typical/High output. For formal documentation, cross-reference your bucket selection against the PCGS Photograde tool (free in PCGS CoinFacts) to confirm you are not over-grading. An over-graded insurance schedule is a liability; an under-graded one means an inadequate payout. Record which condition bucket and which price range you selected, and note the date.
Document the Low, Typical, and High values for the selected condition bucket, not just the middle figure. Note the price source (Assay displays 'Based on recent market data from coins-value.com') and the date stamp shown in the app. For insurance schedules, most underwriters accept the Typical figure as the insured value and treat the High as the replacement ceiling. For probate, recording the full range with methodology is more defensible than a single number, because fair market value inherently involves a range under IRS and state court definitions.
Every Assay result screen displays a disclaimer: estimates assume undamaged, uncleaned coins. That disclaimer is your prompt to make a judgment call. If a coin has been cleaned — identifiable by unnatural brightness, hairlines under a loupe, or a dipped appearance — the actual value may be 30-70% lower than the estimate for a problem-free specimen. Record this in your documentation: 'Coin appears cleaned; value adjusted downward from Typical estimate.' This protects you from an inflated appraisal challenge on a donation or from an insurance adjuster reducing your payout post-claim for undisclosed condition issues.
For any coin where the Assay Typical estimate exceeds $200, add a second documentation layer before finalizing your schedule. Search Heritage Auctions' realized-price archive for recent comparables (filter by grade and certification status). For certified coins, note the Heritage realized price, the sale date, and the cert number. If the collection includes coins above $500 that will be liquidated rather than kept, add a Greysheet Bid lookup as the dealer-floor reference. Three-source documentation — app range, auction comparable, wholesale floor — is what a professional appraiser's opinion letter looks like, and approximating that structure significantly strengthens any formal filing.
Buyer's Guide
Most coin valuation apps are built for curiosity, not documentation. These six criteria separate the apps that produce output you can actually file from the ones that leave you with a number and no audit trail.
A single precise figure is the least defensible output a coin valuation app can produce. Look for Low/Typical/High ranges across multiple condition levels. A range acknowledges market variability, protects against over-valuation challenges, and maps to how professionals — appraisers, insurers, and probate courts — actually think about fair market value.
Insurance underwriters and probate courts need to know when a valuation was produced and what data it was based on. An app that names its price source and displays a date on every result is auditable. An app that returns a number with no attribution is a liability in any formal context — you cannot defend a claim you cannot trace.
This criterion ties directly to documentation integrity. An app that silently values a cleaned coin as if it were problem-free sets up the user for a disputed insurance claim or an IRS appraisal challenge. The best apps display a cleaned/damaged disclaimer on every result, prompting the user to make a conscious, documented judgment about condition adjustments rather than silently accepting an inflated estimate.
For collections containing PCGS or NGC slabs, an app's ability to integrate cert numbers into its output matters. The strongest documentation workflows combine app-generated ranges with cert-specific realized prices from auction archives. Apps that support cert verification or API lookup can auto-populate grade and denomination data, reducing transcription errors in bulk inventories.
App screenshots are not documentation. Look for apps that offer CSV export, formatted reports, or at minimum a result screen whose key fields — coin name, condition, value range, source, date — can be copied cleanly into a spreadsheet. The less reformatting required between app output and your final filing, the lower the risk of a transcription error.
For estate liquidation or donation documentation, the retail value estimate from any app needs to be calibrated against what a dealer will actually pay. Apps or tools that provide Greysheet Bid or equivalent wholesale pricing give you the floor — typically 70-90% of Greysheet Bid per the standard dealer rule of thumb. Without a floor reference, a retail estimate may overstate liquidation proceeds in a probate distribution schedule.
We tested CoinIn and iCoin (Identify Coins Value) during our research and excluded both from this lineup. CoinIn, developed by PlantIn, showed patterns of predatory auto-renewal subscriptions designed to push past the cancellation window, manipulated review counts with high star averages masking a substantial volume of 1-star user complaints, and reports of fake marketplace bot listings that never completed transactions. iCoin carries a 1.6-star average on the iOS App Store across 54-plus reviews, reflecting consistent user reports of poor identification accuracy and an aggressive trial-subscription model. We tested these so you do not have to. Neither app produces output we would trust in a formal documentation context, and both exhibit practices that give us additional reason to exclude them from any recommendation.
FAQ
About This Review