This free version of Voloco Auto Tune has four different effects that let you create completely different sounds. 'Big Chorus' lets you create a song with seven harmonized voices, while 'Hard Tune' lets you apply the classic 'auto-tune' effect. The other effects are 'SuperVocoder' and 'Natural Tune,' which provide less spectacular results.
As an optional feature, you can use the 'backing track' option to add a song in the background to help you keep a steady beat. However, this feature only works if you're using headphones.
Once you finish recording your voice, you can listen to the result with the auto-tune effect applied. If you're happy with it, you can save the audio file to your Android or share it directly through any of your installed apps.
Voloco Auto Tune is an app offering some really fun results. Plus the audio files you create get stored in MP4 format so you shouldn't have any trouble playing them on any other app.