Online track analyzer
- LUFS
- True peak
- PLR / LRA
- Clipping
- BPM
- Key and Camelot
- Mono compatibility
- Tonal balance
- Upscaled files
- Spotify / YouTube / Apple / Yandex
Upload a track — the report is ready in a minute
The analysis is free; you only need a Stream-Q account, and signing up takes half a minute. Up to 5 tracks a day, MP3/WAV/FLAC/M4A up to 80 MB.
What's in the report
The report is built from the same measurements Stream-Q takes for every track in a streamer's queue. It isn't a taste score: the engine can't tell whether your beat is good, but it knows exactly how loud it is, where it clips and how it will sound on a phone in mono.
- Loudness: integrated LUFS, short-term and momentary maximums, the loudness curve over the whole track and a histogram.
- Peaks: 4× oversampled true peak per channel, sample peak, the number of clipped samples and flat-topped runs.
- Dynamics: PLR (peak to loudness), PSR and LRA — you can see whether the master is over-compressed.
- Tempo and key: BPM, key (for example “A minor”) and its Camelot code for DJ mixing.
- Stereo: width, channel correlation, L/R balance and how much loudness is lost when summed to mono.
- Tonal balance: the track's average frequency response against the range of same-genre tracks on Stream-Q.
- Real quality: where the spectrum actually ends and whether an MP3 was re-saved as WAV/FLAC.
- Normalization: how much Spotify, YouTube, Apple Music and Yandex Music will turn the track down or up.
How it works
You upload a file (MP3, WAV, FLAC, M4A, OGG, OPUS — up to 80 MB). It joins the analysis queue and the report is usually ready in a minute or two. Loudness uses the same EBU R128 filter as ffmpeg (0.0 LU off the reference in our tests); tempo and key come from the rhythmic and harmonic structure of the track.
Only you can see the report. To show it to a mixing engineer or in a chat, turn on “Share” and the report gets a link. The audio file itself is deleted from storage after 7 days; the report numbers stay.
Why an account is required
Analysis is real server work: decoding plus several passes over the audio and its spectrum. To keep the tool free and fast, it's available after a free sign-up: up to 5 tracks a day, one at a time. The same account lets you send tracks to streamers for live reviews.
FAQ
Is it really free?
Yes. All you need is a free Stream-Q account. The limit is 5 analyses a day and one at a time.
Which formats are supported?
MP3, WAV, FLAC, M4A (AAC/ALAC), AAC, OGG, OPUS, WEBM and WMA, up to 80 MB. It's best to upload the same file you'll send to your distributor — usually WAV or FLAC.
Who will see my track?
Nobody but you: the report is private by default and the track is not sent to streamers. A public link appears only if you turn on “Share”. The audio file is deleted from storage after 7 days.
How accurate are the numbers?
Loudness and peaks are measured per ITU-R BS.1770 / EBU R128 (like ffmpeg ebur128) — the same figures iZotope Insight or Youlean Loudness Meter show, to a tenth of a unit. Tempo and key are detected algorithmically: on complex music they can land on half or double tempo or on the relative key.
Does the analyzer give mixing advice?
It explains the facts in plain words — for example, that the master is denser than most tracks in its genre or that true peak is above −1 dBTP. There are no artistic verdicts; streamers give those in live reviews.
Other checks
LUFS loudness
Integrated, short-term and momentary LUFS, LRA and the loudness curve per EBU R128.
BPM and key
Tempo in BPM, key and Camelot code — for DJ mixing, picking samples and vocals.
Clipping and true peak
4× oversampled true peak, clipped samples with timecodes, PLR — will the master distort after encoding.
Loudness for streaming
How much Spotify, YouTube, Apple Music and Yandex Music will change your track's volume (−14 LUFS).