Track Report
Free mix and master check: LUFS, true peak and AI detection
Upload your mix or master and get a plain-English report on what to fix before release, measured against your genre.
Free plan available. No credit card required.
What it measures
- Loudness vs genre: LUFS: how loud your song sounds overall. Streaming services turn loud songs down. Your number is shown against a typical range for your genre.
- True peak: the loudest instant in your song. Too close to 0 and it can crackle after streaming conversion.
- Dynamics (PLR): the gap between your loudest peaks and overall loudness, in dB. Bigger gap means more punch; small means squashed.
- Stereo: width and how your track holds up in mono.
- Tonal balance: each frequency band compared with your genre.
- Streaming playback: how much Spotify, Apple Music and YouTube will turn your track up or down.
- AI detection: an estimate of whether the audio shows signs of AI generation. This is an automated estimate, not proof. It can be wrong in either direction. Don't use it as the only basis for saying someone used AI.
See a real report
Every report ends with what to fix, how to fix it, and what's already working.
Files and limits
WAV, AIFF, FLAC or MP3. Up to 5 minutes and 100 MB per track.
What happens to uploads
Tracks are analyzed and then deleted. We keep the results, not the audio, unless you choose to share a track with the Sontra team.
FAQ
What happens to my uploads?
Tracks are analyzed and then deleted. We keep the results, not the audio, unless you choose to share a track with the Sontra team.
How accurate is the AI detection?
It's probabilistic and can be wrong. Treat it as a signal, not proof.
Which files can I upload?
WAV, AIFF, FLAC or MP3, up to 5 minutes and 100 MB per track.
Is it free?
Yes. The free plan includes 2 Track Reports per month. Pro includes 25.