Simple software to add harmonies to midi

Anyone out there know of a simple (stress, simple!) piece of software that could add a one stave harmony to a melody line? Everything seems so complicated

Try Midi Harmonizer

Hi
Thanks for that, but there doesn’t seem to be a Windows 10 version

did you ask the developer if it works on Windows 10?

Often the fastest way to get simple little tasks like this done is to try a website like fiverr or Mechanical Turk.