Sigma Mini vs Coin Tester.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Connects to Sigma Metalytics Mini
- Device interaction and control
- Enhanced functionality for users
- Seamless user experience
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App to be used with the Sigma Metalytics Mini
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.
- Acoustic resonance coin testing
- Artificial intelligence analysis
- Detects counterfeit coins
- Supports gold and silver bullion coins
- Database of coin vintages
- Regular updates for accuracy
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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
Verdict
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
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.
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.
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.
| Parameter | Sigma Mini | Coin Tester. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.4 (121 ratings) |
| Positive reviews | 37.5% of reviews | 64.7% of reviews — better |
| Number of ratings | 2 | 121 — better |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 6 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Bessette | Growth & Value |
Customer experience
Sigma Mini
Coin Tester.
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
Sigma Mini
No in-app purchases
Coin Tester.
- Monthly Access$9.001 Month
- Annual Access$72.001 Year
- 7-Day Access$19.00
Questions
Is Sigma Mini free?
Is Coin Tester. free?
Which has better reviews, Sigma Mini or Coin Tester.?
Do Sigma Mini or Coin Tester. have ads?
Which is updated more often, Sigma Mini or Coin Tester.?
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