What are some alternatives?
When comparing Flowkey and Jameasy for Violin, you can also consider the following products
Simply Piano - Fast and fun way to learn piano
Synthesia - A fun way to learn how to play the piano.
alphaTab - alphaTab is a cross platform music notation and guitar tablature rendering library.
Pianu - Learn to play the piano in your browser.
Yousician - An interactive guitar-learning app.
Skoove - Babbel for learning the piano