Contrapunk

Real-time MIDI harmony and arrangement generator for desktop, browser, VST3, CLAP, and Logic. Play MIDI or guitar and generate counterpoint live.

Open source: the code is at github.com/contrapunk-audio/contrapunk.

First shown on Hacker News on 5 April 2026 as “Contrapunk – Real-time counterpoint harmony from guitar input”, where it reached 118 points and 56 comments. Read the discussion.