Rainbow Piano is a free piano app developed by citifrank for Android 9.0. This app is perfect for music enthusiasts who want to play the piano and have fun at the same time. The app's main features include beautiful piano sounds, a cute deer that runs and dances in the sky with the music, and gorgeous fireworks that light up the screen when the firework switch is turned on. Moreover, users can also listen to classic music in peace when the switch is turned on. Overall, Rainbow Piano is a cute and fun piano app that can provide hours of entertainment for users of all ages.

Rainbow Piano's beautiful piano sound is one of its strongest features. It is clear and crisp, making it a pleasure to listen to. The app also features a cute deer that runs and dances in the sky with the music, adding a fun and whimsical element to the experience. Additionally, users can enjoy the gorgeous fireworks that light up the screen when the firework switch is turned on. The classic music switch is also a great feature for those who want to listen to music without playing the piano. Overall, Rainbow Piano is a great app for anyone who wants to have fun and make music on their Android device.