# 4Comp: AUv3 Compressor Plugin — FET · VCA · Optical · Vari-Mu > Four analog-style AUv3 compressor plugins for iOS music production. (iPhone/iPad app by NATHAN THOMAS MATHIS.) - Source: https://appshunter.io/ios/app/4comp-auv3-compressor-plugin/id6805205834 (this page in markdown: same URL + `.md`) - Developer: [NATHAN THOMAS MATHIS](https://appshunter.io/developer/1870347850) - Category: Music - Price: $4.99 - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 16.0 · 3 MB - Languages: American English, French (France), German (Germany), Italian, Japanese, Polish, Brazilian Portuguese, Russian, Chinese (Simplified, China), Mexican Spanish and 1 more - Released: 2026-10-01 - Data updated: 2026-10-16 - Monetization: paid ## What is 4Comp? Four analog-style compressors in one AUv3 plugin: FET, VCA, Optical and Vari-Mu. Each is its own DSP engine with its own sound, and the whole interface — face, knobs, meters — changes to match the one you pick. New in 1.1: tap ? for a quick start and a guide to each model, and watch the live transfer curve on VCA. FET Fast gain reduction from a feedback detector, with an all-buttons mode. Hi-hats, drum buses, spiky guitars. Ice-blue face. VCA Bus glue with program-dependent AUTO release. Tames transients and spikes without grabbing. Crimson face. Optical Smooth, level-dependent release from a modelled photocell — the cell's light memory. Vocals, brass, strings. Electroluminescent-green face. Vari-Mu A ratio that rises with level, plus harmonic colour that thickens thin tracks. Mix bus and mastering. Brass face. Four separate DSP paths Each model is its own compressor engine rather than a preset over one circuit: feedback FET, two-stage VCA, photocell release, rising-ratio tube. Switch faceplates mid-session and the plugin animates to the new model's look. Complement it Stereo link (Linked or Dual Mono), sidechain high-pass, dry/wet mix, input/output and auto make-up gain, a gain-reduction meter styled for each model and 17 presets. Real-time-safe DSP, 0-sample latency by default. Works in GarageBand, AUM, Cubasis, Loopy Pro and other AUv3 hosts on iPhone and iPad. ## Key features - Four analog compressor models (FET, VCA, Optical, Vari-Mu) - Unique DSP engine and interface for each model - Live transfer curve visualization - Stereo link and sidechain high-pass filter - Dry/wet mix and auto make-up gain - 17 presets included - 0-sample latency ## Is 4Comp safe? Not enough ratings yet to assess 4Comp. ## Is 4Comp legit? 4Comp: AUv3 Compressor Plugin appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 4Comp is 65 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about 4Comp ### 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. ## Version history (last 3 releases) ### 1.2.0 — 2026-10-15 What's new in this version: • Switching compressor models now keeps the model tabs and Input / Output controls in place • The Help sheet now follows the selected model's colours • Moved the Help button beside the model caption • Added bundle and Umbrex links to your local App Store • Improved performance ### 1.1.0 — 2026-10-08 What's new in this version: • A live transfer curve on VCA shows where your signal hits the threshold • Built-in help: tap ? for a quick start and a guide to each compressor model • Save your own presets in hosts that support user presets • Adds VoiceOver and Reduce Motion support • Improved VoiceOver navigation and added Reduce Motion support ### 1.0.0 — 2026-10-01 No release notes. ## More apps by NATHAN THOMAS MATHIS - [NAM AUv3: Neural Amp Modeler](https://appshunter.io/ios/app/nam-auv3-neural-amp-modeler/id6791673543) - [Chromatic Tuner AUv3](https://appshunter.io/ios/app/chromatic-tuner-auv3/id6791699061) - [PitchLock: AUv3 Vocal Tuner](https://appshunter.io/ios/app/pitchlock-auv3-vocal-tuner/id6791833535) - [Umbrex: Music Visualizer](https://appshunter.io/ios/app/umbrex-music-visualizer/id6792601467) - [Afterverb: AUv3 Plate Reverb](https://appshunter.io/ios/app/afterverb-auv3-plate-reverb/id6798475883) All apps by NATHAN THOMAS MATHIS: https://appshunter.io/developer/1870347850 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-16.*