Scale Numbers Piano is a free Android app developed by scaledegrees under the Multimedia category, specifically in Music & Radio subcategory. This app is designed to help singers learn vocal melodies and transpose them into any key that suits their voice. It also provides an easy way for songwriters to sketch chord progressions and compose vocal melodies using major and minor scales.

With Scale Numbers Piano, users can easily notate their songs and practice with chord progressions. The app is user-friendly and easy to navigate, making it accessible to both beginners and professionals. However, some users have reported issues with the display on Huawei and Xiaomi devices.

Overall, Scale Numbers Piano is a great app for anyone who wants to learn and compose music with ease. Its features are useful and practical, and it is definitely worth a try for anyone who is interested in music.