The best alternatives to Polytronome are Musopen, Rythme, and Melody Composer Squared. If these 3 options don't work for you, we've listed a few more alternatives below.
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Celebrating 100 000 downloads. Being created for composers and musicians, Melody Composer Squared also provides answers to curiosity minds what’s the secret of Music. Music is consideration of the math proportions between sounds, enriched with human feelings, so one person can decode feelings of another. You can draw a melody right now.
Musicroamer is a fantastic app for discovering some new songs for your playlist or even recompose it completely! Find similar artists to the one from your musical preferences, and let some new sounds be stuck in your head!