D vs FormSync

[Features] ■ Simultaneous Playback of Multiple Dance Videos Compare a sample video and your own video side-by-side, or view videos shot from various angles all at once! Plus, the app automatically synchronizes the playback positions by analyzing the audio of your videos, making it easy to align the timing of different clips! ■ Loop Playback Set specific segments within a video for seamless loop playback! You can set any number of loop points. Perfect for repeatedly watching and practicing a specific movement from a sample performance! ■ Adjustable Playback Speed Change the speed from 0.1× to 1.0× in 0.1 increments! ■ Individual Video Volume Control Adjust the volume for each video from 0% to 100% in 10% increments. This is useful for balancing volume differences between multiple video sources! ■ Horizontal Flipping You can flip any video horizontally, ideal for mirroring the movements. [Example Use Cases] ・Copying Idol Dances Idol MVs and TV performances often feature camera cuts or close-ups that obscure the choreography. Collect multiple videos (MV, performance clips, etc.) and play them simultaneously with this app. You'll instantly see which video shows the full move, allowing for highly efficient practice! ・Side-by-Side Comparison of Sample and Personal Videos Comparing a sample video directly with your practice video makes it easier to spot where your movements deviate. Automatic playback synchronization ensures a perfect comparison, even if the videos are of different lengths! [Important Notes] ・This app plays videos saved in your Photos Library. It cannot play online videos such as those from YouTube. ・Due to device specifications, playback may become laggy if videos have a high resolution or if you play too many videos simultaneously. ・All features are available for free, but the free version has a limit on the number of projects (groups of videos for simultaneous playback) you can create. You can create as many projects as you like by purchasing the paid option, "Remove Project Limit."

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.