Tests gold and silver coins for authenticity using acoustic resonance analysis
About Bullion Test
Bullion Test is a tools app developed by Timmy Brolin.
Download Statistics
Bullion Test has been downloaded 14 thousand times. In the last 30 days, the app was downloaded 22 times.
User Ratings
Bullion Test is rated 4.01 out of 5 stars. The rating is based on 280 ratings.
App Information
Bullion Test costs $3.49 to download. The APK download size is 9.11 MB. The latest version available is 1.16. The last update was on August 23, 2023.
Technical Requirements
Bullion Test requires Android 2.2+ or higher. The app has a content rating of Everyone. The app has been available on Google Play October 2013.
Description
This app offers a cheap and easy to use method to help detect fake bullion coins, by examining their resonance frequencies.
The resonance frequencies of an object are determined by the objects shape and material. If the shape and weight of a silver coin is correct, but the material is not actually silver, then a resonance test could detect this. This is also known as a "ring test" or "ping test".
Unlike the manual "ring test", this app does not require that the user knows exactly how each coin should sound. The app will also detect resonance frequencies above the range of human hearing.
This youtube video shows how to use this app: http://www.youtube.com/watch?v=5pZnqp3bl3A
Currently, these coins are supported: 1oz American Silver Eagle 1oz Silver Buffalo, flat edge 1oz Silver Buffalo, reeded edge (Sunshine mint) 1oz Liberty Silver 1oz African Wildlife Elephant 1oz Silver Maple Leaf 1oz Philharmonic 1oz Australian Kookaburra 1oz Australian Koala 2oz Australian Lunar 1oz Chinese Panda Swedish 100kr commemorative Swedish 5kr 1954-71 Morgan and Peace silver dollars 1oz Krugerrand 1oz Australian Gold Kangaroo 1oz American Gold Eagle 1oz Gold Vienna Philharmonic 1oz Gold Lunar 1oz Gold Buffalo 1oz Gold Maple Leaf $20 Double Eagle gold coin 20 Franc gold coin Brittish sovereign gold coin
There is also a "generic" feature wich supports ALL .999 1oz silver coins with diameter 36-42mm. Just enter the diameter of your coin, and the app will automatically calculate what it's resonance frequencies are.
How to use this app: 1. For best results you should perform this test in a reasonably silent room. Some electronic devices may produce high-pitch noises which could interfere with the test. 2. Select the type of bullion coin to test from the drop-down list. 3. Press the microphone button to start the test. 4. Blue lines indicate the expected resonance frequencies of the selected coin. 5. Balance the coin on your finger, near the microphone of your smartphone. Tap the coin using your fingernail, or use some hard object. Do NOT use a second coin to tap the first one, since the sound from the second coin may affect the results. The sound level required depends on the sensitivity of the microphone in your Android device. For most devices is it sufficient to gently tap the coin with your fingernail. 6a. If the sound matches the expected resonance frequencies of the selected coin, you will see a green check-mark. 6b. If there is too much noise, or if the sound does not match the expected frequencies, then you will se a red cross. 6c. Some Android devices have microphones which are unable to record high frequencies above ~10kHz. If the app detects two out of three expected frequencies, it will indicate this with the fraction "2/3", and report that device limitations might be the reason why the last frequency was not detected. 7. Some practice may be needed to produce a clean enough sound from the coin. The app is sound-activated, you can tap the coin again to do another test.
Needed permissions: Record audio - To record the sound of the coin. Storage - Necessary to enable "sharing" of test results.
Disclaimer: There are no guarantees whatsoever regarding the function and accuracy of this app. There are many factors which could cause this app to report false positive or false negative results. This app should only be used to complement other testing methods, not replace them.
Forum thread for discussions and information about this app: http://forums.silverstackers.com/topic-38955-android-app-uses-resonance-test-to-detect-fake-silver-coins.html
Recent changes: Updated to support latest Android version
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Overall very good app. Could you add Cook Islands 1oz silver coins .999 please and gold Britannia 1 oz minted before 2012? Thanks
★★★★★Kauai Martial Arts· May 31, 2018
Best bullion tester I have ever used. I wish they had this for iphone also.
Way better than anything on ios. I wish you could upload other coins. Wish
they had more for junk silver
★★★★☆Ashley Stone· Jun 9, 2018
Works well for the supported bullion. Wish there were more fractional
options.
★★★★★Jon Ludlum· Jun 15, 2019
I've been letting people on my coin forums know about this app. Awesome extra test in the arsenal. Please add support for pre 33 $10, $5 and $2.50 coins?
★☆☆☆☆Sailing Home· Mar 4, 2022
Showed a counterfeit Morgan as legit. The Morgan failed the silver-slide test and my coin shop verified that it is bogus. No updates for Galaxy S20 so maybe this is the reason.
★☆☆☆☆Alex Martz· Nov 12, 2021
An abandoned app that used to work and the developer didn't care for all of us who PAID for it!
★★☆☆☆Slawomir Grzonkowski· Jul 19, 2022
The app cannot distinguish between Krugerrand, maple and American Eagle coins. Except that it's useful. There are the most popular coins but from a paid app, I would expect much more choices. Thus, 2 stars instead of 3 or 4.
★☆☆☆☆S Evans· Jan 30, 2026
SCAM! Paid for app via Google Play and nothing installed to my Samsung G7. The only option it gives is "Refund" rather than "Install". When I click "Refund" Google says "We cannot provide a refund for this purchase because it is not supported by our policy." What a waste of time and a few bucks.
★☆☆☆☆Nathan M· Jan 20, 2020
Need fractional such as gold 1/10, 1/2 oz, 1/4, gold eagles. 1/10 gold maples etc
Google Play Rankings for Bullion Test
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Technologies used by Bullion Test
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