Pingcoin is the digital version of the classical "ping test" for catching counterfeit coins. By recording and analyzing the sound produced by your coins the app is able to tell you if the coin is genuine or not.
If you've ever found yourself not quite 100% sure about a coin's authenticity, try the ping test with the Ping Coin app. It will allow you to buy with confidence at coin fares and garage sales.
A coin, like a musical instrument, produces a characteristic sound. Like a musical instrument this sound depends on its shape and on the material its made out of. A wooden flute sounds different compared to a copper one. Similarly two coins of the same size and weight will sound differently based on the material they're made of.
The app will compare the characteristic sound of your coin (usually comprised of three frequencies) to my reference values. For each coin and for each frequency a tolerance threshold is displayed. If your coin's frequencies fall within the thresholds, it will almost certainly be genuine!