Perfect Piano is an Android app that simulates a piano with an 88-key keyboard. It has various modes such as single-row, double-row, dual players, and chords mode. The app has multitouch screen support, force touch, and keyboard width adjustment. It comes with multiple in-built sound effects such as Grand piano, Bright Piano, Music Box, Pipe Organ, Rhodes, and Synthesiser. The app also has MIDI and ACC audio recording, metronome, and direct sharing of recording files or setting them as ringtones. It supports USB MIDI keyboard and timbre plug-ins that are free to download and install.

Perfect Piano has a "Learn to Play" feature that allows users to learn thousands of popular music scores with three guidance patterns: falling note, waterfall, and music sheet (stave). It has three play modes: auto play, semi-auto play, and note pause. Users can set up left and right hand, use A->B loop, adjust speed and difficulty.

The app also has a "Multiplayer Connection & Competition" feature that allows users to play the piano with other players from all over the world, make friends, and have real-time online chat. It has a weekly new song challenge ranking and allows users to create guilds.

Lastly, Perfect Piano has a small piano widget for the home screen that allows users to play music without opening the app. If users have any questions regarding the use of the app, they can contact the developers through feedback or Facebook.

Overall, Perfect Piano is a comprehensive app that offers a wide range of features for piano enthusiasts. It has a realistic keyboard, multiple sound effects, and supports various modes and recording options. The "Learn to Play" feature is a great addition for beginners, while the "Multiplayer Connection & Competition" feature adds a social aspect to the app. The small piano widget is also a convenient feature for quick access to the app.