The Bass Tuner app is a free Android app for tuning the bass. The app is mainly focused on microphone-free tuning, meaning that you press a button to emit the right sound for the note, and then you do the processing and tune the instrument. The app can be used on both tablets and phones as long as it has a recent Android version. You should also use headphones with this app, as on stage or in other noisy places you will not be able to receive the sound correctly. While the app only tunes EADG, it has 6 themes you can choose from, as well as record audio files you can use later. While the recording function can be used for recording, the other is better. The app does have the issue with crashing all the time on outdated phones and tablets if you press buttons that go to unused menus. The Bass Tuner app is a free Android app that works well on Android 6.0 and is best used with headphones that have loud bass and that have a good processor to record as many audio samples as possible.