The best alternatives to The Melody App are Melodics, Melody Generator, and Melodist. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Melodics is your personal tutor. A cross between beat making software and a game that will help you get better at keys, pad drumming and electronic drums.
Use this AI music melody generator to generate a simple music melody, in both sound and notation forms. Customize the tempo, key signature, time signature, and more!
Use Melody Generator to make random MIDI melodies. The melodies are procedurally generated and are royalty free. You can export the MIDI or WAV file to use in your own music.