Open Collective
Open Collective

iPlug2 Developers

iPlug2 is a free, liberally licensed audio plug-in framework for desktop, mobile and web


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Support the following initiatives from iPlug2 Developers.

Fix standalone app audio i/o issues

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Today’s balance

$26,767.63 USD

Total raised

$26,767.63 USD

Total disbursed

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Estimated annual budget

$26,964.03 USD


iPlug 2 is a simple-to-use C++ framework for developing cross-platform audio plug-ins/apps and targeting multiple plug-in APIs with the same minimalistic code. It abstracts an audio plug-in (IPlug) and its drawing engine/GUI toolkit (IGraphics). IGraphics is a simple UI toolkit with good performance which contains a collection of common controls well suited for audio plug-ins, either using bitmap or vector graphics. Alternatively examples are included showing how you can use technologies such as HTML/CSS or SwiftUI on top of a C++ DSP layer.

The original version of iPlug was released in 2008 as part of Cockos' WDL library. iPlug 2 (2018) is a substantial reworking that brings multiple vector graphics backends to IGraphics (including GPU accelerated options and HiDPI/scaling), a better approach to concurrency, support for distributed plug-in formats and compiling to WebAssembly via emscripten, amongst many other things.

iPlug 2 targets the VST2, VST3, AUv2, AUv3, AAX (Native) and the Web Audio Module (WAM) plug-in APIs. It can also produce standalone win32/macOS apps with audio and MIDI I/O, as well as Reaper extensions. Windows 8, macOS 10.11, and iOS 14 are the official minimum target platforms, but depending on the graphics backend used, you may be able to make it work on earlier operating systems.

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