https://contrapunk.com/

let harmony = Engine.new(Palestrina);
fn detect_pitch(buf) -> Note
const MAX_VOICES: usize = 4;
voice_leading.reject_parallels()
struct GuitarInput { onset }
engine.harmonize(note, scale)
Contrapunk
GETTING STARTED CLOUD LAUNCH APP 
Contrapunk

CONTRAPUNK

Real-time MIDI harmony generator and guitar-to-MIDI converter. Proper
counterpoint rules. Sub-10ms latency. Built in Rust.

TRY IN BROWSER DOWNLOAD FOR MAC GET STARTED

Free. No login. Browser works in Chrome with any MIDI controller.

CONTRAPUNK WITH A GUITAR

COMING SOON

CONTRAPUNK CLOUD

AI is not going to kill music as long as people keep playing music
together. So let's jam!

Low-latency audio meets real-time counterpoint harmony across
players.

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You're in! Download the Mac DMG here or see install instructions.

No spam. Just a heads up when Cloud launches.

 HARMONY ENGINE

8 harmony modes with real counterpoint rules. Palestrina, Bach, Jazz,
Free. 28 scale modes. Deterministic voicing.

 GUITAR INPUT

Plug in your guitar. Real-time pitch detection, onset tracking,
auto-calibration. Play guitar, hear counterpoint.

[?] SUB-10MS LATENCY

Single-cycle detection, 2-frame voting, 128-sample buffers. Fast
enough for live performance.

 RUNS EVERYWHERE

Native desktop via Tauri. Browser via WebAssembly. Server mode for
studios. Same Rust core everywhere.

 VOICE LEADING

Parallel fifths rejection. Voice crossing prevention. Spacing rules.
Centuries of music theory, in code.

 OPEN SOURCE

MIT licensed. Counterpoint rules are centuries of human knowledge.
They should be accessible to every musician.

FUN FACT

There was a 1970s Indonesian progressive rock band also called
Contrapunk that released an album called "Putri Mohon Diri". They
blended traditional Indonesian instruments, intense guitar work, and
classical influences. Listen on YouTube.

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CONTRAPUNK AUDIO

BUILT WITH RUST, SVELTEKIT, TAURI, AND A DEEP LOVE FOR MUSIC.

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