"Piano - Simple Easy-to-use" is a straightforward piano app designed for iPhone users. The app offers a unique vertical orientation for playing the piano on your phone, a feature not commonly found in similar applications. This orientation allows for easier sound checking in portrait mode compared to landscape mode, enhancing user experience.

Moreover, the app provides flexible customization options, allowing users to adjust the number of steps and tiers from 3 to 5 for easy use. With a variety of instrument choices including Piano(Warm), Piano(Bright), E-Piano(Classic), and more, users can explore different sounds and styles to suit their preferences.