D vs Frame by Frame

[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."

A video player built for studying dance choreography and sports form. Pick a video from your photo library and examine every detail. Features: - Slow motion: 0.1x–3x (0.01x–50x with Premium) - Frame stepping with centisecond timecode and frame numbers - Jog dial and frame ruler: step through frames without your finger covering the video - A-B repeat: loop just the section you're working on - Return point: drop a flag and jump back with one tap - Two-video comparison: play a reference and your own recording side by side, each with its own speed and A-B loop, or step both frame by frame in sync - Mirrored playback for learning choreography from facing videos - Hold-to-speed: play faster or slower only while you press the screen - Pinch to zoom and pan, brightness/contrast/saturation adjustment - Switch portrait/landscape with the rotate button (ignores device rotation) - A guided tour with a sample video - One-tap access to recent videos Your videos stay on your device and are never uploaded. Premium (one-time purchase) removes all ads and unlocks 0.01x–50x speeds, Picture in Picture and screen rotation in 4 directions.