PolyrhythmLab
Polyrhythmic Groovebox & VJ
$4.99 · Designed for iPad. Not verified for macOS.
Now with a real AUv3 plugin for GarageBand/Logic/AUM, live MIDI output to other gear, and AirPlay casting for VJ Mix — plus save/reload VJ presets.
PolyrhythmLab is a groovebox built around true polyrhythms: every sound layer gets its own step count, pulse count, and rotation, so layers of different lengths interlock and drift in and out of phase instead of locking to one shared grid.
NEW IN 2.0 — AUv3 PLUGIN
Use PolyrhythmLab as a real instrument inside GarageBand, Logic, AUM, and any other AU-compatible host. Four independent polyrhythmic layers, each exposed as automatable parameters, real MIDI output so your performance actually records as a MIDI region, and its own compact control panel with a live pattern wheel, a randomizer, and optional sync to your session's tempo.
NEW IN 2.0 — LIVE MIDI OUTPUT
Send a real Note On/Off for every layer hit straight from the main app — one MIDI channel per layer, over a virtual MIDI connection — to drive another synth, app, or piece of hardware in real time, not just sync tempo.
NEW IN 2.0 — CAST VJ MIX
Send the VJ Mix visuals to a TV or projector over AirPlay or a wired adapter, while your device keeps the full set of live controls. Save and reload VJ Mix setups — visual styles, effects, camera moves, and their LFOs — as named presets, same as patterns.
GROOVEBOX
• Euclidean-style rhythm engine — set steps, pulses, and rotation per layer
• Drums, glitch/textural one-shots, classic synth voices (piano, bell, pad, bass), and melodic synth patches
• Per-layer filter, reverb, delay, pitch, and LFOs on every parameter
• Randomize engine biased toward musical, playable combinations
• Chord modes, scales, and modal note selection for melodic layers
SONG MODE
Arrange your saved patterns into sections and chain them into a full song.
VJ MIX
A live visual performance surface: blend two audio-reactive visualizations, layer on real-time color and shader effects — RGB split, kaleidoscope, pixelate, glow, trail — and a 3D camera with zoom, pan, orbit, and tilt, each with its own LFO. Randomize the whole look by hand, or hand it to an autonomous "robot" that keeps remixing itself. Record the performance in real time via ReplayKit, or export a styled video clip.
PRESETS
Save and reload both groovebox patterns and VJ Mix setups as named presets.
EXPORT
Render your patterns and songs to audio, or export them as MIDI.
No account, no ads, no analytics. Everything is stored locally on your device.
• AUv3 plugin: use PolyrhythmLab as a real instrument inside GarageBand, Logic, AUM, and more.
• Live MIDI output — drive other synths and apps from your patterns in real time.
• Cast VJ Mix visuals to a TV or projector via AirPlay.
• Save and reload VJ Mix looks as presets.
• iPad layout and stability fixes.
The developer, Martin Adler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Martin Adler
- Size
- 420.3 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Martin Adler
