Flowkey is an app to help you learn songs and keep piano playing fun for you, and cannot teach you proper technique. There are multiple skill levels to choose from including beginner to pro, but from using this app, it seems it would benefit beginners who aren't yet fluent in reading sheet music.

Terms of service:

• This is not a private account. You're not allowed to change any user info (Email, Password, Settings, Profiles etc.)
• You're recommended to use this account on one device at a time.
• Breaking any of these terms will lock the account and void the warranty immediately.