The 123 Bass Tuner app is a free Android app for tuning a bass. The app requires Adobe Air in order to function, but works in the background and repeats the sounds so that you are not to continuously click the buttons. The sounds for the EADG notes are very long and the button has to be clicked to stop them. This app might be a cross-platform app, as the Adobe Air can work on OS-es other than Android. The app can be used on both tablets and phones and can function on recent Android OS-es with powerful processors. The app has a really efficient and effective design, as it resembles and amplifier and can play all the 4 notes from the bass. The app can be used with headphones that have a clear sounding bass boost and a environment that does not have much low sounds. The 123 Bass Tuner app is a free Android app for tuning the bass that you can use on platforms other than Android, as it works with Adobe Air and can be an app to search for when on other platforms as it functions and does not lag.