FormSync

Compare videos side by side

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

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 - Landscape mode on the compare screen - Swap one video and keep the other — compare new takes against your reference, one after another - 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 side-by-side video (saved to your camera roll, ready to share) - 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.

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- Pinch to zoom in on your videos — check the fine details up close, and your zoom is kept in exported videos too - The compare screen now supports landscape — view side-by-side videos larger - Draw straight lines to compare form (PRO) — spot differences in angle and alignment at a glance, baked into your exports too - Auto-detect pose (PRO) — one tap draws a full-body skeleton with spine, shoulder and hip lines, and shows the spine angle for your golf swing

Version 1.5.0

The developer, Hiroki Sugiyama, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Identifiers

Privacy practices may vary based, for example, on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Provider
  • Hiroki Sugiyama
Size
  • 36.8 MB
Category
  • Photo & Video
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English and Japanese
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © 2026 Hiroki Sugiyama
  • Privacy Policy

    • More by Hiroki Sugiyama

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