HarmonyKeen turns a MIDI melody into added harmony parts with a rules-based engine instead of machine learning. Its app scans the full tune first, spots phrase endings, works out fitting chords, then builds extra parts with voice-leading rules. Same inputs and settings always return the same notes.
Users can feed it MIDI, draw notes, play a keyboard, or grab a DAW track. From there, it can make one companion part, tight vocal stacks, four-part writing, or larger setups. One to three voices can sit above, below, or around the lead, and every note stays editable.
Finished parts can head back into a DAW on separate MIDI tracks, while notation export covers PDF and MusicXML. HarmonyKeen runs standalone on macOS and Windows, with VST3 on both and AU on Mac. Logic Pro, GarageBand, Ableton Live, Cubase, FL Studio, and Reaper are supported. Intro pricing sits at $59 through version 1.1, with macOS 11 and Windows 10 version 2004 as the minimum systems.
Users can feed it MIDI, draw notes, play a keyboard, or grab a DAW track. From there, it can make one companion part, tight vocal stacks, four-part writing, or larger setups. One to three voices can sit above, below, or around the lead, and every note stays editable.
Finished parts can head back into a DAW on separate MIDI tracks, while notation export covers PDF and MusicXML. HarmonyKeen runs standalone on macOS and Windows, with VST3 on both and AU on Mac. Logic Pro, GarageBand, Ableton Live, Cubase, FL Studio, and Reaper are supported. Intro pricing sits at $59 through version 1.1, with macOS 11 and Windows 10 version 2004 as the minimum systems.
