Drop a track and see its shape — where it builds, peaks and sags. The arc is measured from the file itself, then read back to you in plain English with a fix for every problem. See your song's shape, find where it sags, fix the structure.
It doesn't change your analysis. It helps us build a free, anonymous benchmark of how real tracks are shaped — which later powers a genre overlay. Your audio never leaves the browser.
These are free while we build them. The genre overlay switches on once enough tracks have been measured to draw an honest benchmark — we won't show a made-up line before then.
The tool decodes your file in the browser and walks two loudness envelopes across it: a short-term loudness curve using the ITU-R BS.1770 standard — the same loudness math streaming platforms use — and a finer RMS envelope for shape detail. Together they trace how the energy of the track rises and falls from the first second to the last.
Section boundaries are placed where the energy changes sharply. That is an honest estimate, not a claim about song form — so the tool labels each section generically and lets you drag the dividers or rename them. It will never tell you "this is your chorus" and pretend it knows.
Nothing is uploaded. The audio is read with the Web Audio API on your device; only anonymous shape metrics — intro length, peak position, dynamic range — are counted so we can build a free genre benchmark over time.