Alt Denoiser vs HARQ ClearVoice

Alt Denoiser is a real-time audio noise suppression plugin based on DeepFilterNet. It is free and open source, with precompiled downloads for Windows, macOS and Linux in VST3, VST2, AU, LV2 and Standalone formats. DeepFilterNet3 models are bundled, so no separate model download is needed. The plugin accepts any host sample rate and resamples automatically. Its interface has an attenuation control and 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 mention fixes for stutter and dropouts in EqualizerAPO and DAWs at standard host buffer sizes. Linux build instructions cover Ubuntu/Debian, Fedora and Arch; building from source requires CMake 3.15 or later, Rust and a C++ compiler. The project is licensed under GPLv3 and directs questions and bug reports to GitHub Issues. macOS binaries target macOS 14.0 and later.

HARQ ClearVoice is paid workstation software for real-time microphone noise cancellation and accent neutralization during calls. It filters sounds such as traffic, barking dogs, and other agents before audio reaches a softphone. HARQ states that processing has 40 ms latency, runs on the CPU, and does not require a GPU. Audio remains on the workstation instead of being sent to a server, and the software can work offline. Accent neutralization is described as signal-level speech enhancement that preserves natural speech; it is not translation or text-to-speech. A virtual audio device outputs the processed signal, which the user selects as the softphone input. Named compatibility includes Talkdesk, Genesys, Five9, Avaya, and any SIP client using that device. ClearVoice is enabled as a toggle on an existing HARQ presence agent, without a separate installer. Auto-updates are included per device. Pricing is metered per device per month through an AWS Marketplace private offer, with rates supplied by sales.