Tempo speed ramps

Drop a clip + a song. We detect beats and slow time into each hit, then snap back. Just like the big edits, without doing it by hand.

1 · Video clip

Drop a video clip

or click, MP4 / MOV / WebM · vertical works best

Drop a song

or click, MP3 / M4A / WAV

Slow-mo depth 0.35x Lead-in (seconds before beat) 0.5s Snap-back 0.15s

Green curve = playback speed over time. Dips into each detected beat.

Drop a video and a song to start.

Real-time ramping, uses HTMLVideoElement playbackRate driven by the beat track. webm imports into CapCut, Premiere, DaVinci.