Audio Unit (au) Jun 2026

Apple defines several AU sub-types, each tailored to a specific role:

Audio Unit is a robust, mature, and highly efficient architecture. It offers the smoothest experience for Mac-based producers, particularly those in the Logic ecosystem. However, its inability to function outside of Apple’s hardware makes it a commitment. audio unit (au)

| Feature | Audio Unit (AU) | VST (Steinberg) | AAX (Avid) | CLAP | |---------|----------------|-----------------|------------|------| | | macOS/iOS | Windows/macOS/Linux | macOS/Windows | Cross-platform | | System integration | Deep (Core Audio) | None | Pro Tools only | None | | Real-time safety | High (RT safety API) | Varies | High | High | | MIDI 2.0 support | Yes (macOS 11+) | Partial | No | Yes | | Sandboxing | Yes | No | No | Optional | | Parameter automation | Yes (Floating point) | Yes | Yes | Yes (advanced) | Apple defines several AU sub-types, each tailored to

Developed by Apple, is a system-level plug-in architecture for macOS and iOS. It is part of the Core Audio framework, meaning it is deeply integrated into the operating system itself. | Feature | Audio Unit (AU) | VST

If you are working exclusively in Logic Pro or Final Cut Pro, you must use AU, as these Apple programs do not support VST. If you use a cross-platform DAW like Ableton Live or FL Studio on a Mac, both will work, but AU often provides a smoother UI experience on macOS. Types of Audio Units