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Alt Denoiser

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What Alt Denoiser is

Alt Denoiser is a free, open-source plugin for reducing audio noise in real time. It uses DeepFilterNet3 models bundled with the plugin, so setup does not require a separate model download. The project offers precompiled downloads for Windows, macOS, and Linux, in VST3, VST2, AU, LV2, and Standalone formats. It is designed to work in audio hosts, including DAWs; release notes give Cubase, Reaper, FL Studio, and EqualizerAPO as examples. The plugin accepts any host sample rate and resamples automatically. Its interface has a single attenuation knob, plus input and output RMS meters. Version 1.0.2 supports mono-to-mono, stereo-to-stereo, and mono-to-stereo routing, and declares 1,920 samples of latency for startup and reset FIFO prefill. Release notes describe fixes for audio stutter and dropouts in EqualizerAPO and DAWs at buffer sizes of 128, 512, and 1,024 samples. macOS binaries target macOS 14.0 and later. Linux builds use non-executable stack permissions to address loading failures on security-hardened distributions. Users building from source need CMake 3.15 or later, Rust, and a C++ compiler. The project is licensed under GPLv3, with GitHub Issues for questions and bug reports.

Who it suits

Alt Denoiser suits people who want real-time noise suppression in an audio host, including DAW users and people using EqualizerAPO or Windows microphone input devices. It is also an option for users who want an open-source plugin and can use one of its supported formats and operating systems.

What it does well

Includes DeepFilterNet3 models; no separate model download is needed.
Supports VST3, VST2, AU, LV2, and Standalone formats.
Accepts any host sample rate with automatic resampling.
Offers mono and stereo routing configurations.
Precompiled binaries are listed for Windows, macOS, and Linux.
Licensed under GPLv3.

What to know first

The attenuation control is a single knob.
macOS binaries target macOS 14.0 and later.
Building from source requires CMake 3.15 or later, Rust, and a C++ compiler.

Getting started

Open the project website on GitHub.
Choose a precompiled release for Windows, macOS, or Linux and the desired format.
For macOS, use a system running macOS 14.0 or later.
Load the plugin in a compatible audio host, or use the Standalone format.
For a source build, install CMake 3.15 or later, Rust, and a C++ compiler.
On Linux, follow the build instructions for Ubuntu/Debian, Fedora, or Arch; JUCE needs X11/XWayland client headers, including under Wayland.

Verdict

Choose Alt Denoiser if you want a free, GPLv3 noise suppression plugin with bundled models and several plugin formats. Check the operating system and format requirements before choosing it, particularly if you need to build from source or use macOS earlier than 14.0.

Questions

How much does Alt Denoiser cost?

It is free and open source.

Which operating systems and formats are supported?

Precompiled binaries are listed for Windows, macOS, and Linux in VST3, VST2, AU, LV2, and Standalone formats.

Does it need a separate noise model download?

No. DeepFilterNet3 models are bundled with the plugin.

What routing configurations does it support?

Version 1.0.2 supports mono-to-mono, stereo-to-stereo, and mono-to-stereo.

What license does it use?

The project states that it is licensed under GPLv3.

Where can users ask questions or report bugs?

The repository provides GitHub Issues for project questions and bug reports.

Facts from Alt Denoiser's own pages

Audio routing: The v1.0.2 release notes list Mono-to-Mono, Stereo-to-Stereo, and Mono-to-Stereo routing support. · github.com, 8 Oct 2026
Build requirements: Building from source requires CMake 3.15 or later, Rust, and a C++ compiler. · github.com, 8 Oct 2026
Controls and metering: Its interface has one attenuation control and input/output RMS meters. · github.com, 8 Oct 2026
Downloads: The Releases page lists precompiled Windows, macOS, and Linux builds in VST3, VST2, AU, LV2, and Standalone formats. · github.com, 8 Oct 2026
Host compatibility: The release notes mention fixes for audio stutter and dropouts in EqualizerAPO and DAWs at standard host buffer sizes including 512, 1024, and 128 samples. · github.com, 4 Oct 2026
Host examples: The release notes cite Cubase, Reaper, and FL Studio as example DAWs for the VST3 plugin. · github.com, 8 Oct 2026
Intended users: The project describes plugin builds for audio hosts and a standalone app that can run without a host. · github.com, 8 Oct 2026
Latency: The v1.0.2 release notes state that the processing FIFO uses a declared 1920-sample latency. · github.com, 8 Oct 2026
License: The project is licensed under GPLv3. · github.com, 8 Oct 2026
Linux security fix: The v1.0.3 release notes say Linux plugin libraries use non-executable stack permissions to address loading failures on security-hardened distributions. · github.com, 8 Oct 2026
Linux setup: The build instructions list GUI and audio development dependencies for Ubuntu/Debian, Fedora, and Arch Linux and note that JUCE requires X11/XWayland client headers even under Wayland. · github.com, 4 Oct 2026
macOS requirement: The v1.0.3 release notes say macOS binaries target macOS 14.0 and later. · github.com, 8 Oct 2026
Noise reduction model: The plugin bundles DeepFilterNet3 models, so no external model download is required. · github.com, 4 Oct 2026
Noise suppression model: DeepFilterNet3 models are bundled in the plugin, so they do not require separate downloads. · github.com, 8 Oct 2026
Plugin formats: The project lists VST3, VST2, Standalone, AU, and LV2 formats. · github.com, 8 Oct 2026
Purpose: Alt Denoiser is a real-time AI audio noise suppression plugin based on DeepFilterNet. · github.com, 8 Oct 2026
Sample rates: The plugin supports any host sample rate with automatic resampling. · github.com, 8 Oct 2026
Support: The repository exposes GitHub Issues for project questions and bug reports. · github.com, 4 Oct 2026

Where Alt Denoiser stands on Freedom251

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