SPIRAL by GLENDER
SPIRAL by GLENDER: A capable free mastering workflow with local processing and reference-based listening tools. Ranked #23 of 50 in AI Music Mastering Software by our editors (6.1/10); pricing: Free plan; best for privacy-conscious users wanting free local mastering.
At a glance
- Editor score6.1 / 10
- PricingFree plan
- Best forPrivacy-conscious users wanting free local mastering
- Free planYes
- Paid fromFree
- Reference track matchingYes
- Facts checked22 Sep 2026
Where it wins
- Processes unlimited tracks locally without uploading audio
- Includes reference comparison and level-matched A/B listening
- Exports 24-bit WAV files with loudness and true-peak metering
Where it doesn't
- Available through the web rather than desktop or mobile apps
- Support is limited to email
- No paid tier adds expanded features or platform options
Our verdict on SPIRAL by GLENDER
SPIRAL by GLENDER is a free browser-based audio mastering engine for independent producers, DJs, bedroom producers, and professional engineers. It processes audio locally in the browser, without requiring an account or uploading tracks. The workflow supports WAV, MP3, and FLAC input, then combines mix analysis, corrective EQ, saturation, compression, tonal EQ, mid-side processing, brickwall limiting, and 24-bit WAV export. Personal and commercial use are included, with unlimited track processing.
The strongest part of SPIRAL is its listening and metering workflow. Mix analysis covers LUFS, spectrum, dynamics, and true peak, while real-time LUFS and true-peak meters help assess the result. Reference-track comparison and level-matched A/B listening provide a way to compare a master against another track without relying only on louder playback. These features make the product more suitable for users who want to make informed mastering decisions than for those looking for a single automatic output.
Pricing is straightforward: the Free plan includes unlimited track processing, local browser processing, and personal and commercial use. The product is donation-funded, and there are no paid tiers to compare. That keeps access simple, but it also means the feature set and platform scope remain focused. SPIRAL runs on the web, with no desktop or mobile option listed, and support is provided by email. Choose it if local processing, privacy, reference comparison, and WAV export matter more than a wider app ecosystem. Users who need native applications or tier-based support should consider an alternative.
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SPIRAL by GLENDER pricing
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SPIRAL by GLENDER fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Monthly masterings | Not verified |
| Reference track matching | Yes |
| Stem mastering | Not verified |
| WAV export | Yes |
| Loudness targets | Yes |
| Input formats | WAV, MP3, FLAC |
| Supported platforms | Web |
| Deployment | Cloud |
| Platforms | Web |
| Support | |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan (source) |
| Website | spiral.glenderdj.com |
| Facts checked | 22 Sep 2026 |
Alternatives to SPIRAL by GLENDER
- iZotope OzoneA mature DAW mastering suite with broad control, references, and stem workflows.9.4
- Waves Online MasteringA focused web mastering service with reference matching, previews, and flexible credit plans.9.1
- MixeaA web mastering service for comparing many AI-generated master variations.9.0
See all SPIRAL by GLENDER alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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