Harmony Pro vs PLAYBOX

Harmony Pro helps composers and producers explore chord possibilities while a piece takes shape. Its suggestion engine offers Balanced, Conservative, Exploratory, and Jazz Expert profiles, with controls for richness, boldness, modal character, continuity, exploration, and style fit. A progression workspace includes key detection and playback. Users can inspect harmony in keyboard, guitar, and sheet views, and use scale and common-tone controls, reverse chord lookup, a progression generator, and a voicing explorer. Chord audio playback is available. Harmony Pro runs on macOS, Windows, and the web. On macOS and Windows, it is available as AU and VST3 plugins; the maker says the VST3 version is intended for Ableton Live. The maker says the app has no AI. It may ask permission to send minimal usage statistics and technical data, while stating that musical content is not transmitted. Users can change this choice at any time. The listed plan is free.

PLAYBOX has no write-up on Specifiction yet; its figures are above.