Modular synthesizer for Android

Your modular
rack.
In your pocket.

RackDroid brings the VCV Rack 2 audio engine to Android, with touch instead of a mouse. Drag real cables between oscillators, filters and sequencers — no compromises, no clone: it's the same engine, made native for your phone.

66 built-in modules Android 10+ GPLv3, open source ~40 MB
RackDroid running: a patch with a sequencer, VCO, VCF and ADSR
ParkBar on Samsung Galaxy S22 VCF-1 CUTOFF CV
🔌 STATUS: CABLE PARKED ON PARKBAR

👆 Tap the smartphone screen to connect the cable to the VCF-1 module!

🔌 NEW UPDATE FEATURE

Dedicated Section: Cable ParkBar

Connecting distant modules on touch screens was a physical limit: you can't pan the rack while holding a cable. The ParkBar gives you 10 parking slots on the edge of the screen to temporarily drop any cable, scroll the rack freely, and then drag the jack straight to its destination.

TECHNO MANIFESTO

Not a cute synth app. A raw 48kHz mobile sound system.

Forget toy preset apps. This is the real festival modular engine compiled to set your phone screen on fire.

Heavy metal DSP

Raw upstream VCV Rack 2 C++ code untouched. No simplified mobile synth algorithms, just pure DSP horsepower.

Dancefloor touch patching

Grab jacks, rip cables, perform live drops and build instant sub-bass build-ups straight on your touchscreen.

Zero-delay live performance

Oboe + AAudio tuned to the absolute lowest buffer. Drop kicks in perfect sync with the club PA system.

Clouds. Rings. Plateau. Bogaudio.

Drop a .rdmod file and Audible Instruments, Valley, Befaco or Bogaudio load instantly. No app update. No store approval. Just drop and patch.

arm64-v8a & x86_64 Support

Phones, tablets, Chromebooks, or Android-x86 PCs. If it runs Android 10 or later on arm64-v8a or x86_64, RackDroid is ready to rock.

No subscription. No account. No joke.

GPLv3. Every line of source on GitHub. You own it. Run it forever.

SEQ 3
BPM
GATE
CV
VCO
PITCH
1V/OCT
SAW
VCF
CUTOFF
AUDIO
MOD
LP
LFO
RATE
TRI
ADSR
DECAY
TRIG
ENV
SCOPE
IN
⚡ Drag or click jacks to route patch cables across the modules

WALL OF SOUND

A full Eurorack wall of sound in your hands.

Acid sequencers, screaming filters, and green phosphor CRT scopes reacting live to your patch.

A live patch in RackDroid
RackDroid's toolbar and menus
MARBLES
DEJA VU
T1
X1
RINGS
BRIGHT
STRUM
V/OCT
EVEN
CLOUDS
PITCH
IN L
OUT L
PLATEAU
DECAY
IN L
OUT L
SCOPE
IN
⚡ Drag or click jacks to route patch cables across the modules

Inside the rack

What it includes

Everything you need to build a sound from scratch, already in the base APK.

🎚️

Audio engine

Native, Oboe/AAudio, full-duplex, low latency.

🧩

66 modules

Core, Fundamental (39 modules), RackDroid Drums (14 original voices).

👆

Real touch

Cables and modules with a finger, pinch to zoom, long-press for values.

🪟

Glass toolbar

Menus, module palette, plugin manager, undo/redo, layout lock.

🧲

Module palette

Chips by category, draggable previews, an info badge for every module.

🧵

Cable parking

Park a cable end on a bar, scroll to the far module, drop it on the port. 3 to 10 holes.

🎹

MIDI

On-screen keyboard, USB and Bluetooth LE MIDI.

⏺️

Recording

Output to a WAV file, saved in Documents/RackDroid/.

🎓

Guided learning

A spotlight interface tour on first run, 30 step-by-step tutorials, plus a topic guide.

Module Explorer

Explore Built-in & Extra Modules

Search through all 66 base modules and downloadable .rdmod packages by category or keyword.

Ready to build your first sound?

Free, open source, no account. Download the APK from the repository and you're in within a minute.

↓ Download RackDroid on GitHub
Requires Android 10 (API 29) or later · arm64-v8a & x86_64 · OpenGL ES 3.0