SPIRAL by GLENDER
SPIRAL by GLENDER is a browser-based audio mastering workspace for examining, shaping, comparing, and exporting tracks locally.
What SPIRAL by GLENDER is
SPIRAL by GLENDER is a browser-based audio mastering workspace for examining, shaping, comparing, and exporting tracks locally. Its analysis reports LUFS loudness, true peak and clipping, dynamics, spectrum, stereo correlation, and phase. The adjustable chain includes high-pass filtering, corrective EQ, saturation, compression, tonal EQ, mid-side control, and brickwall limiting. Users can level-match an A/B comparison with the original, loop sections, and inspect a reference track’s LUFS, spectrum, and dynamics. A built-in assistant provides reference-aware guidance, with presets for transparent, punchy, or vintage starting points. SPIRAL accepts MP3, WAV, FLAC, AAC, OGG, and M4A, then exports mastered WAV at 16-bit, 24-bit, or 32-bit float precision. Processing occurs locally in browser memory, without an account, installation, or export paywall. It is free to use and funded by voluntary donations. The privacy policy says it uses no cookies or analytics trackers, though Google Fonts may collect anonymized usage data.
Good
- Detailed loudness, spectrum, and phase analysis
- Adjustable mastering chain
- Reference-track comparison tools
- Exports WAV at three precisions
- No account or installation required
Watch out
- Requires a modern browser with Web Audio
- Google Fonts may collect anonymized usage data
- Donations fund the free tool
Who it suits
SPIRAL suits producers who want to make informed mastering decisions before release. It fits users seeking local browser processing and multiple audio analysis and export options.
Verdict
SPIRAL provides analysis, mastering controls, reference comparison, and WAV export in a browser. Local processing and no export paywall make it practical for producers working before release.
Plans and prices
From SPIRAL by GLENDER's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| SPIRAL | Free | No account required · no export paywall · local browser processing · WAV export at 16/24/32-bit float · Free to use; funded by voluntary donations |
The facts
Each one read from SPIRAL by GLENDER's own pages, with the date it was checked.
What it does
- Analysis
- It reports LUFS loudness, true peak and clipping, dynamics, spectrum, stereo correlation, and phase.checked 9 Oct 2026
- Assistant and presets
- The site describes a built-in assistant that gives reference-aware guidance and presets for transparent, punchy, or vintage starting points.checked 9 Oct 2026
- Comparison
- Users can level-match an A/B comparison with the original, loop sections, and analyze a reference track's LUFS, spectrum, and dynamics.checked 9 Oct 2026
- Cookies and tracking
- The privacy policy says SPIRAL uses no cookies, analytics trackers, user identification, login, or profiling.checked 9 Oct 2026
- Donations
- The maker says the tool is funded by voluntary donations, with donations processed through Stripe; SPIRAL says it does not store payment card details.checked 9 Oct 2026
- External service
- The privacy policy states that the site loads fonts from Google Fonts and that Google may collect anonymized usage data.checked 9 Oct 2026
- Formats
- It accepts MP3, WAV, FLAC, AAC, OGG, and M4A, and exports mastered WAV at 16-bit, 24-bit, or 32-bit float precision.checked 9 Oct 2026
- Installation
- No installation is required; SPIRAL is a website that needs a modern browser with Web Audio support.checked 9 Oct 2026
- Intended users
- The maker presents SPIRAL as a free mastering tool for producers who want to make informed decisions before release.checked 9 Oct 2026
- Mastering chain
- The adjustable chain includes high-pass filtering, corrective EQ, saturation, compression, tonal EQ, mid-side control, and brickwall limiting.checked 9 Oct 2026
- Privacy
- The privacy policy says SPIRAL does not collect, store, or transmit personal data, audio files, or usage information, and audio processing occurs locally in browser memory.checked 9 Oct 2026
- Purpose
- SPIRAL is a browser-based audio mastering workspace for analyzing, shaping, comparing, and exporting tracks locally.checked 9 Oct 2026
- Support
- The privacy page lists [email protected] for privacy-related questions.checked 9 Oct 2026
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