AudioRetoucher is described as 'tool for analyzing music, changing tempo and pitch in real time' and is an app in the Audio & Music category. There are more than 10 alternatives to AudioRetoucher for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Audacity, which is both free and Open Source. Other great apps like AudioRetoucher are Sonic Visualiser (Free, Open Source), AudioMass (Free, Open Source), Transcribe! (Paid) and Amazing Slow Downer (Freemium).