Quiztones is a frequency ear trainer for amateur and professional audio engineers, producers, and musicians.
Quiztones uses tones and frequency-altered noise and musical loops (including source material from your own music library) to train your ears and help develop more acute listening and frequency recognition skills.
In essence you listen to sine waves and guess the frequency, listen to loops and guess the gain, or listen to loops and guess the frequency gain. The interface is very simple and understandable, this is perhaps due to the app also being available on iOS.
This screenshot is from the Audiofile Engineering website. My score would be much worse.
I think this app is a fantastic little resource especially for someone like me who did not get formal training in anything electronic in college. I found the gain quizzes pretty easy but once I tried the sine wave and frequency gain tests I was put in my place. To the credit of the app I was not discouraged, rather the ease of use and presentation are certainly encouraging.
Personally I think Quiztones is a must-buy, especially on iOS. The app is robust, inexpensive, and does exactly what it set out to do with no fuss. I think Quiztones could perhaps even be used in quickly testing out some new monitors or headphones.
On a 5 star scale I give Quiztones a Yes.