Simple Piano Pro PLUS is a free Android app that offers 21 keys, 15 sharps, and 3 octaves, for a total of 36 keys. The app boasts high-quality, realistic sounds and HD sound quality. With 7 different color options for the keyboard, the design is simple and convenient, without any distracting colors.

One of the standout features of Simple Piano Pro PLUS is the ability to choose from 5 different sustain modes, as well as a pack of 12 quality pianos, 6 different blown instrument packages, and 6 different ringtones packs. The app also includes 12 different instrument packs, for a total of 36 instrument options.

Users can play rhythm music with 12 drum infrastructures and add quality to the background music they play with 12 different chords. The BPM adjustment feature is available for both drums and chords, and the flexible keyboard sizing feature allows users to shape their keyboard according to their preferences.

The app also includes many different sound effects, and users have the ability to adjust instrument and drum or chord sounds. With the option to place note names on the keyboard as desired, Simple Piano Pro PLUS is a versatile and customizable app that offers many features for free.