Cathar vs SpectraLayers Pro

Cathar is a free audio restoration toolkit for Linux and macOS, with tools to clean, enhance, and level recordings. It accepts WAV, MP3, FLAC, OGG, and M4A files, along with audio tracks inside MP4 and MKV video, and writes WAV, FLAC, or AIFF according to the output filename extension. Restoration options include denoising, de-humming, de-winding, de-clicking, de-clipping, de-reverberation, spectral repair, de-plosive processing, and rustle removal. Enhancement tools handle de-essing, breath removal, voice isolation, and bandwidth extension; loudness and peak normalization prepare delivery levels. The Rust toolkit uses inspectable and tunable DSP stages. Effects can run through the Rust crate or as command-line steps in a media pipeline. An optional machine-learning feature adds a deterministic GRU denoiser with safetensors weights. Optional terminal tools provide an audio player and spectrogram viewer. Cathar is licensed under Apache 2.0 or MIT, and its latest listed release is v0.8.0; the project describes itself as pre-1.0.

SpectraLayers Pro is a spectral audio editor that presents sound as visual objects for editing, repair, restoration, and sound design. Pro 13 adds Unmix Sound Effects to separate short sounds from continuous backgrounds such as wind, crowds, traffic, and nature. Ambience Heal fills gaps using ambience from the source layer, while Reconstruct resynthesizes selected spectral data. Voice DeClick removes mouth noises, and Voice DeCrosstalk isolates unwanted voices from a target voice. The software supports batch processing and can run standalone or as an external editor. Listed integrations include Ableton Live, Final Cut Pro, Logic Pro, Reaper, DaVinci Resolve, FL Studio, ACID Pro, Vegas Pro, KONTAKT, REAKTOR, HALion, and Tracktion Waveform; edited audio can be returned to the calling app. Pro 13 supports specified recent macOS releases on Intel and Apple silicon, and Windows 10 or 11 64-bit from version 21H2; Windows 11 on Arm requires 24H2 or later. A free trial is available, but no free plan or price is listed.