The Best Tuner app is a free Android app for tuning musical instruments. You can also use it to tune your voice or to recognise chords is a song. The app can tune any instrument, but has a number of presets to make it more precise in tuning. Those are: Banjo, Ukulele soprano, Ukulele concert, Violin, Viola, Violoncello and Double Bass. You can also set a lot of temperaments for tuning correctly as well as the frequency of the note A4 with precision in cents. You can set the note notation to be: American, European or Solmization and the settings are saved after you close and reopen the app. The frequency recorded is always displayed on the screen when you are tuning and so are all of your settings. The app is sensitive and keeps the sound displayed on the screen even after you have tuned your instrument. You can also use this tuner as a sound tuner, meaning that you can listen to the strings being picked and after than you can do the processing and tune your instrument. The Best Tuner app is a really well adapted app, which means that it works on screens all sizes and requires current Android OS versions (4.1 and up).