Cathar
Cathar: A free, wide-ranging toolkit for restoration, normalization, and batch audio workflows. Ranked #4 of 24 in Audio Restoration Software by our editors (7.9/10); pricing: Free plan; best for free, comprehensive restoration and batch workflows.
At a glance
- Editor score7.9 / 10
- PricingFree plan
- Best forFree, comprehensive restoration and batch workflows
- Free planYes
- Paid fromFree
- Noise reductionYes
- Facts checked20 Sep 2026
Where it wins
- Covers denoising, hum, clicks, declipping, spectral repair, and dereverberation
- Processes audio and video inputs, then exports WAV, FLAC, or AIFF
- Supports batch directories and embeddable Rust library pipelines
Where it doesn't
- Its workflow is centered on command-line and Rust-library use
- Output is limited to WAV, FLAC, or AIFF formats
- Advanced restoration requires choosing among multiple processing methods
Our verdict on Cathar
Cathar is an open-source command-line and Rust-library toolkit for restoring audio files and video tracks. It suits users who need a free standalone workflow for cleaning, repairing, leveling, or processing multiple files, as well as developers embedding restoration pipelines in Rust applications. It accepts WAV, MP3, FLAC, OGG, M4A, MP4, and MKV inputs, and writes WAV, FLAC, or AIFF output. The published feature set covers denoising, hum and wind removal, click and crackle suppression, declipping, dereverberation, spectral repair, de-plosive processing, rustle reduction, and loudness normalization.
Its main strength is breadth within a focused restoration workflow. Broadband denoising can use spectral subtraction or Wiener filtering, while optional GRU-based machine-learning denoising adds another approach. Hum removal supports fixed-frequency and adaptive harmonic cancellation; declipping includes A-SPADE and alternative reconstruction methods; and spectral repair addresses transient artifacts, whistles, bursts, and glitches. Voice isolation, LUFS-aware loudness and peak normalization, and batch directory processing extend Cathar beyond a single cleanup operation. The self-contained Rust binary also avoids an ffmpeg dependency.
Cathar is particularly well suited to technically comfortable users who value open-source software, repeatable file processing, and the ability to embed restoration logic through a Rust library API. Its standalone workflow and command-line orientation make it less suitable for buyers seeking a graphical editing environment or a broader production suite. The format flow is also specific: Cathar accepts several audio and video inputs but produces WAV, FLAC, or AIFF files. Choose it when restoration range, batch handling, and developer access matter more than an interface-led workflow.
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Cathar pricing
Cathar fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Noise reduction | Yes |
| Click and crackle removal | Yes |
| Hum removal | Yes |
| Declip repair | Yes |
| Spectral repair | Yes |
| Batch processing | Yes |
| Workflow format | Standalone |
| Deployment | Self-hosted |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Cathar
- iZotope RXA mature restoration suite with broad repair tools, DAW integrations, and costly higher tiers.9.4
- SpectraLayers ProA deep restoration editor for spectral work, batch processing, and DAW-based workflows.9.0
- Waves RestorationA focused restoration bundle for basic noise, hum, click, and crackle removal.8.3
Cathar vs the competition
- Cathar vs iZotope RX
- Cathar vs SpectraLayers Pro
- Cathar vs Waves Restoration
- Cathar vs CEDAR Cambridge
- Cathar vs Diamond Cut Audio Restoration Tools 11.09
- Cathar vs Neiro
Compare Cathar with any tool side by side →
Also Ranked In
Cathar is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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