01
Drop the class playlist on the window. Each song brings the BPM from its tags, or the app detects one.
Drop your playlist, type the tempo your students can dance to today, and every song plays at it, in its original key. Next week, type a faster one.
Your students learn the pattern at 88 BPM. The songs you love for it run at 96, 104 and 112. So you pick slower songs you like less, or you pitch a song down and the singer sounds drunk, or you let them struggle at full speed.
01
Drop the class playlist on the window. Each song brings the BPM from its tags, or the app detects one.
02
Type today’s tempo, for example 88.
03
Play. Every song runs at 88, in its own key. Next song, same pulse.
04
Next week, type 94. Same songs, a little faster.
The target stays where you put it. Today it’s 88 — next week it might be 94.
⊺ Drop Audio Files Here (mp3 · wav · flac · m4a · ogg)
1Drop track here
2Change BPM
Space (hold)Play at the track’s original tempo
EnterPlay / Pause
← →Previous / Next track
Double-click a rowPlay that track
÷2 / ×2Halve / double the detected BPM
Click the waveformSeek
Media keys, dragging a row into Ableton and opening a folder from the Finder are the app’s, not the browser’s.The same time-stretching the Mac app uses, loaded straight into this page. Your files never leave it — they are decoded in the browser and nothing is uploaded. The demo takes up to eight files at 60 MB each; the app opens a whole folder.
Free, no sign-up. The button goes straight to the DMG.
Download for macOSNo. Tempo and pitch are separate. A song slowed from 104 to 88 stays in its key.
It’s made for class and practice. Many dancers and DJs don’t want stretched music on a social floor, and they have a point.
From the BPM in the file’s tags. Untagged songs get a detected value marked ~. If it’s double or half, ÷2 / ×2 fixes it.
Yes. No account, no sign-up. The download button goes straight to the app.