Functional Ear Trainer is a mobile app developed by Sergiy Korchan that teaches you to recognize tones in the context of a particular musical key. This method is based on Alain Benbassat's approach to learning how to recognize intervals and acquire perfect pitch. The app is designed to help you develop a better musical ear, which is essential for composing, improvising, transcribing melodies, or playing with others.

The Functional Ear Trainer is different from other ear training methods because it teaches you to distinguish between tones in the context of a particular key. This method helps you recognize the role of each tone in the key, making it easier to recognize the same tone in other keys of the same scale. The app guarantees that anyone can develop this skill, regardless of their musical background or age. All you need is to practice for 10 minutes a day.

The app is perfect for both beginners and professional musicians who want to improve their musical ear. You don't even need to play a musical instrument to use it. With regular practice, you can gradually develop the skill of recognizing tones and improve your ability to play music by ear.