Comparison

Sigma Mini vs Coin Tester.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sigma Mini

This utility app connects to a specific hardware device for enhanced functionality. It allows users to interact with and control the connected device, providing a seamless experience for its intended purpose. The application is designed for users who own the associated hardware.

Highlights
  • Connects to Sigma Metalytics Mini
  • Device interaction and control
  • Enhanced functionality for users
  • Seamless user experience
Features
Read full description

App to be used with the Sigma Metalytics Mini

About

Coin Tester.

This app helps you verify the authenticity of one-ounce gold and silver coins using acoustic resonance and artificial intelligence. It analyzes the unique sound a coin makes when struck to detect counterfeits. Regular updates ensure accuracy for various coin types and conditions.

Highlights
  • Acoustic resonance coin testing
  • Artificial intelligence analysis
  • Detects counterfeit coins
  • Supports gold and silver bullion coins
  • Database of coin vintages
  • Regular updates for accuracy
Read full description

Coin Tester is an advanced application that allows users to verify the authenticity of one-ounce gold and silver coins. The application uses the method of acoustic resonance (known as the ping test) and artificial intelligence to determine whether the user is dealing with a genuine coin. When struck, a coin vibrates and emits a unique sound, primarily influenced by its dimensions and the material it is made of. For example, a gold Maple Leaf will sound different than a silver Krugerrand when struck. An authentic gold or silver coin will produce a different sound than a counterfeit one. These differences are precisely used by the Coin Tester application. Interestingly, mints release coins each year with a newly physically minted vintage. Additionally, changes in the coin production process, wear and tear, and the appearance of patina on silver create minor differences that affect the sound of the coins. Using artificial intelligence, the Coin Tester application guides users through the coin verification process and assists in determining the authenticity of the product. We have access to a large database of new and circulating coins, allowing us to regularly add updates that include coins from new vintages. This ensures that the application functions accurately for all types of coins, regardless of their condition, type, or minting year. With subscriptions, you can access coin verification for a week, a month or a year. Current list of gold coins: Britannia 1 oz American Eagle 1 oz Vienna Philharmonic 1 oz Australian Kangaroo 1 oz Krugerrand 1 oz Canadian Maple Leaf 1 oz American Bison 1 oz Australian Emu 1 oz Current list of silver coins: Britannia 1 oz American Eagle 1 oz Vienna Philharmonic 1 oz Australian Kangaroo 1 oz Krugerrand 1 oz Canadian Maple Leaf 1 oz Armenian Noah's Ark 1 oz

Screenshots

Sigma Mini4 screens
Coin Tester.4 screens

Verdict

The call

The clearest difference is rating: Sigma Mini at 5.0 against Coin Tester.'s 4.4. Sigma Mini also leads on in-app purchases (none vs 3) and iOS requirement (11.0 vs 14.0). Coin Tester.'s advantage is review sentiment (65% vs 38%) and ratings volume (121 vs 2). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Coin Tester. sells 3 in-app purchases, starting at $9.00 per month. Sigma Mini asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sigma Mini holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Coin Tester. has 121 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 38% of Sigma Mini's written reviews are positive against 65% of Coin Tester.'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Sigma Mini ships an update every 2 months, Coin Tester. monthly. The most recent releases landed on September 14, 2026 and September 8, 2026 respectively.

Scorecard6 real differences · 4 level
Sigma Mini versus Coin Tester.: the parameters behind the verdict, then further details
ParameterSigma MiniCoin Tester.
PriceFreeFree
Rating5.0 (2 ratings) — better4.4 (121 ratings)
Positive reviews37.5% of reviews64.7% of reviews — better
Number of ratings2121 — better
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better14.0
Further details — not scored
Size6 MB95 MB
Age rating4+4+
DeveloperRichard BessetteGrowth & Value

Customer experience

Sigma Mini

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive37.5%
Neutral12.5%
Negative50.0%

Coin Tester.

All ratings121 ratings
Positive86.8%
Neutral0.0%
Negative13.2%
Written reviews34 reviews
Positive64.7%
Neutral0.0%
Negative35.3%

Bugs and requests

Sigma Mini

Not enough reviews yet to summarise bugs or requests.

Coin Tester.

Reported bugs

3 issues
  • Test results are not accurate
  • App fails to identify genuine coins
  • App gives positive test for non-coin objects

Requested features

3 requests
  • Expand coin database
  • Improve accuracy of tests
  • Clarify pricing and subscription model upfront

In-app purchases

None

Sigma Mini

No in-app purchases

3 purchases

Coin Tester.

Subscriptions2
  • Monthly Access$9.001 Month
  • Annual Access$72.001 Year
One-time1
  • 7-Day Access$19.00

Questions

Is Sigma Mini free?
Sigma Mini is free to download, with no in-app purchases.
Is Coin Tester. free?
Coin Tester. is free to download, with in-app purchases available.
Which has better reviews, Sigma Mini or Coin Tester.?
Sigma Mini is rated higher. Sigma Mini averages 5.0 out of 5 from 2 ratings, while Coin Tester. averages 4.4 from 121 ratings.
Do Sigma Mini or Coin Tester. have ads?
Neither Sigma Mini nor Coin Tester. shows ads.
Which is updated more often, Sigma Mini or Coin Tester.?
Sigma Mini ships an update every 2 months, and Coin Tester. monthly. Most recently, Sigma Mini was updated on September 14, 2026 and Coin Tester. on September 8, 2026.

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