FormSync: Swing & Form Compare

FormSync lets you place two videos side by side and play them together — a simple app for checking form.

Compare any kind of movement: dance, golf, tennis, baseball, training, and more. Put a reference next to yourself, or your past form next to today's, and spot the differences at a glance.

Features

• Pick two videos from your camera roll and view them side by side
• Play and pause both videos at the same time
• A shared seek bar to move both to the same position
• Slow-motion playback (0.25x / 0.5x / 0.75x / 1x)
• Set a start point for each video and fine-tune it in 0.05s steps
• Jump to start / skip forward 10s / back 10s
• Pinch to zoom in and check the fine details up close (zoom is kept in your exports too)
• Landscape mode on the compare screen
• Swap one video and keep the other — compare new takes against your reference, one after another
• Mirror view — flip either video horizontally to match your reference's direction
• Draw straight lines to compare form — angle and alignment (PRO)
• Auto-detect pose — full-body skeleton and spine angle drawn in one tap (PRO)
• Export your comparison as a single video, landscape or vertical 9:16 (saved to your camera roll, ready to share)
• Set an end point and export just the range you want to show
• Save your comparisons to history, name them, and revisit them

Free

• Compare any videos — preview plays 10 seconds from your chosen start points
• Export comparisons up to 10 seconds (with a small watermark)
• Keep your 5 most recent comparisons in history

PRO (one-time purchase)

• Play and compare videos in full length
• Draw straight lines to compare form — angle and alignment, baked into your exports too
• Auto-detect pose — full-body skeleton plus spine angle for your golf swing, in one tap
• Export full-length comparisons (watermark can be turned off)
• Keep unlimited history

All videos are processed on your device and are never uploaded to a server.

For iPhone.