4Comp: AUv3 Compressor Plugin
FET · VCA · Optical · Vari-Mu
About
This audio plugin offers four distinct analog-style compressor models (FET, VCA, Optical, Vari-Mu), each with its own sound and interface. It provides advanced features like stereo linking, sidechain filtering, and real-time transfer curve visualization.
What's New in 4Comp
1.3.0
November 2, 2026
• Redesigned the editor with one card per model: FET, VCA, OPTICAL and VARI-MU • Every knob now sits on one aligned grid, so values and captions line up from card to card • Restyled OPTICAL with a brushed-steel panel and a cream VU meter • Added a gain reduction bar with a dB scale to FET, in the editor and the rack • VCA RATIO, ATTACK and RELEASE now click between their settings, with a tick at every stop • FET ATTACK and RELEASE now get slower as you turn clockwise and show their times in µs and ms. Saved sessions keep their sound • Moved the Help button below INPUT / OUTPUT • Removed the BYPASS button, since your host already provides one • Updated the app icon
MoreDeveloper apps
FAQ
What are the four compressor models in 4Comp?
4Comp offers four distinct analog-style compressor models: FET, VCA, Optical, and Vari-Mu. Each model has its own dedicated DSP engine and a unique interface that changes to match the selected compressor type.
Does 4Comp work with GarageBand and other DAWs?
Yes, 4Comp is designed to work as an AUv3 plugin within popular iOS DAWs such as GarageBand, AUM, Cubasis, and Loopy Pro on both iPhone and iPad.
What is the price of 4Comp?
4Comp is a paid application, available for $4.99. This one-time purchase grants access to all its features and models.
How often is 4Comp updated?
The app was last updated on October 15, 2026, to version 1.2.0. This indicates a relatively active development cycle, with updates addressing features and guides.
What devices support 4Comp?
4Comp is supported on both iPhone and iPad devices. It is rated for ages 4 and up, making it accessible for a wide range of users.
Does 4Comp have ads?
No, 4Comp does not contain advertisements. As a paid application, it provides an uninterrupted user experience without any ad interruptions.
What is the latency of 4Comp?
4Comp features real-time-safe DSP with 0-sample latency by default. This ensures that the plugin operates with minimal delay, which is crucial for live performance and precise mixing.
What new features were added in version 1.1?
Version 1.1 of 4Comp introduced a quick start guide accessible by tapping the question mark icon, providing assistance for each model. It also added a live transfer curve display for the VCA model.
