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.

What "speed ramp" means: the video slows down right before each beat, then snaps back at full speed on the hit. Great for dance clips, action, drops.

Clip: 10–30s of continuous motion (dance, skate, action pans)
Song: anything with a clear beat — 30s clip is enough
Tip: nudge Slow-mo depth to 0.25x if the beat is aggressive

1 · Video clip

Add a video clip

Tap to add. MP4 / MOV / WebM · vertical works best

2 · Song

Add a song

Tap to add. MP3 / M4A / WAV or a video file (MP4/MOV)

3 · Ramp shape

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

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

Preview

Add a video and a song to start.

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