Piano Keyboard shows adverts. Samsung and Asus users highly appreciate this application. You can download the .apk installer of Piano Keyboard 3.1 free of charge and have a look at users' reviews on Droid Informer. This file size doesn't exceed 3 MB and the app runs flawlessly on Android 2.3.3 and higher.
The app was checked for viruses and it was found 100% safe.
Based on the users’ opinions, the definite advantage of this application is an easy UI, although some people think that Piano Keyboard features such a disadvantage as useless ads.