SPIRAL by GLENDER is a browser-based mastering workspace for producers who want to analyze and shape tracks before release. It reports LUFS loudness, true peak, clipping, dynamics, spectrum, stereo correlation, and phase. The adjustable processing chain includes high-pass filtering, corrective and tonal EQ, saturation, compression, mid-side control, and brickwall limiting. You can compare a level-matched version with the original, loop sections, and inspect a reference track’s loudness, spectrum, and dynamics. A built-in assistant offers reference-aware guidance, and presets provide transparent, punchy, or vintage starting points. SPIRAL accepts MP3, WAV, FLAC, AAC, OGG, and M4A files, and exports mastered WAV at 16-bit, 24-bit, or 32-bit float precision. Processing runs locally in browser memory; no account or installation is required. The tool is free to use, with voluntary donations processed through Stripe. Its privacy policy says it does not collect, store, or transmit personal data, audio, or usage information, though the site loads fonts from Google Fonts, which may collect anonymized usage data.
Who it is for
SPIRAL suits producers who want to examine and adjust tracks in a browser before release. It requires a modern browser with Web Audio support.
What is good
- Reports loudness, dynamics, spectrum, stereo correlation, and phase.
- Offers level-matched A/B comparison and reference analysis.
- Exports WAV at 16-bit, 24-bit, or 32-bit float.
- Audio processing happens locally in browser memory.
- Free to use, with no account or installation required.
What to know first
- Requires a modern browser with Web Audio support.
- Google Fonts may collect anonymized usage data.
- Donations are voluntary and processed through Stripe.
Verdict
SPIRAL provides analysis, mastering controls, comparisons, and WAV export in a browser, with local audio processing. It is free to use, though its site loads Google Fonts, which may collect anonymized usage data.
SPIRAL by GLENDER plans and pricing
All plansCompared on AI music mastering software
- Free plan
- Yes
- Reference track matching
- Yes
- WAV export
- Yes
- Loudness targets
- Yes
- Input formats
- WAV, MP3, FLAC
- Supported platforms
- web
