Quantara Music
Quantara Music is a browser-based mastering tool that processes audio on the user’s device with deterministic DSP.
What Quantara Music is
Quantara Music is a browser-based mastering tool that processes audio on the user’s device with deterministic DSP. Its adjustable chain has 15 stages with A/B bypass, and loudness references cover streaming services, clubs, broadcast, and vinyl. The site lists 33 genre starting points across seven categories. Live metering displays BS.1770 loudness in LUFS, true peak, spectrum, waveform, and gain reduction. Input files can be WAV, FLAC, MP3, M4A, AAC, AIFF, or OGG up to 500 MB. Exports include 16-bit and 24-bit WAV; the Label plan adds 32-bit float WAV and REST API access with personal keys. Pro and higher users can upload a commercial reference track to match tonal balance, dynamics, and loudness. The free plan includes three exports per month without a credit card. A Single stereo master costs €4.99, paid once for one track with HD WAV export. Quantara says mastering audio is processed locally and not transmitted to or stored on its servers. It supports web use.
Good
- Processing stays on the user's device
- 15-stage chain with A/B bypass
- Detailed loudness and spectrum metering
- Supports seven listed input formats
- Free plan includes three monthly exports
Watch out
- Free plan limits exports to three monthly
- Files are limited to 500 MB
- Reference matching requires Pro or higher
- 32-bit float WAV requires Label
Who it suits
It suits producers, AI music creators, and DAW users seeking browser-based mastering with metering and genre starting points. Reference matching and API automation are aimed at users on higher plans.
Verdict
Quantara Music offers local, browser-based mastering with detailed meters, presets, and multiple export levels. Its free tier provides a starting point, while reference matching and automation require paid plans.
Plans and prices
From Quantara Music's own pricing page, checked 21 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 1 export with a watermark |
| Pay Per Track | €4.94, paid once | Single-track purchase · €4.94 per track, one-time |
| Single stereo master | €4.99, paid once | One track · HD WAV export · billed once |
| Pro | €8.99 a month | Unlimited exports · €8.99/month or €89.90/year |
| Studio | €12.99 a month | Monthly or annual subscription · €12.99/month or €129.90/year |
The facts
Each one read from Quantara Music's own pages, with the date it was checked.
What it does
- Account security
- The privacy policy says passwords are stored as salted hashes and two-factor authentication is available.checked 21 Oct 2026
- Adjustable chain
- Users can adjust a 15-stage mastering chain with real-time controls and A/B bypass.checked 21 Oct 2026
- API
- The site describes REST API access with personal API keys for automating mastering workflows on a Label plan.checked 21 Oct 2026
- Audio privacy
- Quantara says it does not receive, store or access audio mastered in the browser.checked 21 Oct 2026
- Availability limitation
- The terms provide no guaranteed uptime and say individual features can be temporarily unavailable.checked 21 Oct 2026
- Data deletion
- Users can delete an account, after which server-side account data is permanently removed within 30 days.checked 21 Oct 2026
- Export formats
- Exports include 16-bit WAV, 24-bit WAV, 32-bit-float WAV on Studio, FLAC and MP3 320 depending on plan.checked 21 Oct 2026
- Exports
- The site lists 16-bit and 24-bit WAV exports, plus 32-bit float WAV on the Label plan.checked 9 Oct 2026
- File limits
- The studio accepts WAV, FLAC, MP3, M4A, AIFF, and OGG files up to 500 MB.checked 9 Oct 2026
- Genre presets
- The site lists 34 genre starting points grouped into seven categories.checked 21 Oct 2026
- Independent description
- THEJO AI describes Quantara as a free browser-based mastering tool with local processing and real-time metering.checked 21 Oct 2026
- Independent format observation
- THEJO AI lists WAV, MP3, FLAC, M4A, AIFF and OGG as supported inputs and 16-bit, 24-bit and 32-bit-float WAV outputs by plan.checked 21 Oct 2026
- Independent launch date
- The independent THEJO AI directory lists June 22, 2026 as Quantara's launch date.checked 21 Oct 2026
- Independent library claim
- THEJO AI says the Cloud Library can store, search, filter, tag and annotate uploads and masters across devices.checked 21 Oct 2026
- Independent pricing observation
- THEJO AI's directory page displayed no pricing information in its pricing field.checked 21 Oct 2026
- Independent stem claim
- THEJO AI claims Quantara can separate tracks into vocals, drums, bass and instruments using six Demucs models.checked 21 Oct 2026
- Input formats
- The studio accepts WAV, FLAC, MP3, M4A, AAC, AIFF and OGG files up to 500 MB.checked 21 Oct 2026
- Intended users
- The site describes the product as built for producers and highlights workflows for AI music creators and DAW users.checked 9 Oct 2026
- Local processing
- Mastering runs locally in the browser through Web Audio and the audio file is not uploaded for mastering.checked 21 Oct 2026
- Loudness targets
- Targets cover Spotify, Apple Music, YouTube, Tidal, Amazon, Deezer, iTunes, Club, Beatport, SoundCloud, EBU R128 broadcast and vinyl.checked 21 Oct 2026
- Mastering controls
- The feature set includes high-pass and shelving EQ, low-mid and presence EQ, noise and hiss reduction, 31-band EQ, saturation, compression, stereo-width controls and true-peak limiting.checked 21 Oct 2026
- Mastering limitation
- The studio guide says mastering polishes a finished mix and cannot repair problems such as buried vocals or muddy bass.checked 21 Oct 2026
Where it runs
- Browser deployment
- No plug-in installation is required; the product works entirely in a web browser.checked 21 Oct 2026
The company
- Content ownership
- The terms say users retain ownership of uploaded and mastered content and Quantara does not use it to train models.checked 21 Oct 2026
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