MOVINdow
Compare videos by overlay — semi-transparent videos, played in sync
Make any video semi-transparent with adjustable opacity, stack it on another, and play both in sync. Two swings, two jumps, two laps — overlaid in a single view, differences visible directly. Move, zoom, and rotate each video to line up the forms. Free, on-device, iPhone/iPad/Mac.
Adjustable opacity
Open a video's editing menu and create a semi-transparent version — opacity is freely adjustable. Everything is computed on-device, and the result can be used like any other video in the player.
Line up, then play
Drag, zoom, and rotate each video to align the two forms, then press play: both videos run in sync. Combine with frame-by-frame stepping to compare the overlay one frame at a time.
Onion-skin comparison for coaching
Coaches call this onion-skin comparison: past and present form, student and model, left and right side — overlaid so that differences in posture, timing, and trajectory show up in one view instead of two. See also sports video analysis.
Use cases
- Before/after form check: overlay last month's swing on today's.
- Pro vs. self: put a reference form behind your own.
- Left-right symmetry: mirror-compare both sides of a movement.
FAQ
- How do I overlay two videos on iPhone?
- In MOVINdow, open a video's editing menu and create a semi-transparent version with adjustable opacity. Stack it on another video, line them up by dragging, zooming, and rotating, and play both in sync.
- Can I adjust the transparency?
- Yes, opacity is freely adjustable, so you can balance how strongly each video shows through.
- Do the overlaid videos stay in sync?
- Yes. Synced playback is MOVINdow's core: play, pause, change speed, or step frame by frame, and both videos move together.
- Is this useful for sports form comparison?
- Yes — this is onion-skin style comparison: two swings or jumps overlaid in one view, so differences in posture and timing are directly visible. See also sports video analysis.