MARS 多角度フォームチェック vs MotionTagger

MARS は、複数台のカメラ映像を同時に表示・録画し、その場で再生して確認できるマルチアングル録画アプリです。スマートフォンをリモートカメラとして使い、ローカルネットワークで低遅延につなぐことで、三脚1台では難しい「正面・側面・真上」からの同時記録を手軽に実現します。 弓道なら、引分けから会・離れ・残心へと至る一連の動きは、正面・側面に加えて真上から見ることで崩れに気づけます。とくに会から離れにかけての体の開きや矢の通りは、なかなか自分では確認できない真上からの映像が役立ちます。さらに画面に基準線（縦横十文字）を重ねられるので、軸の通りや水平・垂直のブレを正確に照合できます。撮影 → その場で再生・確認 → 改善 のサイクルを、機材を増やさずに回せます。 ■ こんな方に ・弓道の射法八節、とくに会・離れ・残心を多角度で確認したい ・正面や横だけでなく、真上からの映像でフォームを確認したい ・素振りやスイングなどスポーツのフォームを複数の角度から同時に見たい ・1台のカメラでは死角ができて困っていた ■ 主な機能 ・複数カメラの同時録画（手持ちのスマホを、正面・側面・真上など好きな位置にカメラとして追加） ・ガイド線表示：縦・横の基準線とグリッドを映像に重ね、体の軸のブレや水平・垂直を確認（弓道の縦横十文字のチェックにも） ・撮ったその場でスロー再生・コマ送りして確認 ・QRコードで素早くカメラを接続、低遅延のローカル通信 ・録画の保存・共有（フル機能版） ■ 弓道以外のスポーツでも MARS は競技を選ばないリモートカメラ録画アプリです。ゴルフのスイング（後方と正面の同時撮影）、野球のピッチング・バッティング、テニスのサーブ、ダンスの振り付けやフォーメーション、剣道・空手など武道の型まで。スマホがもう1台あれば、「自分では見えない角度」からのフォームチェックをどんな練習でも行えます。 ■ 無料版とフル機能版（買い切り） 無料版でも、複数カメラのライブ表示と「撮ったその場での再生確認」が使えます。 買い切りのフル機能版にすると、 ・録画した動画の保存 ・録画の共有 ・録画停止後もカメラ接続を維持（毎回つなぎ直す手間がなくなる） が解放されます。サブスクではなく1回の購入で永続。同じ Apple ID なら他の端末でも「購入を復元」で使えます。 ※ リモートカメラを使うにはカメラ役のスマホにも MARS が必要です（無料のままでカメラとして参加できます）。 ※ 端末同士の接続にローカルネットワークを使用します。

Review every movement, one frame at a time. MotionTagger brings recording, slow-motion review, side-by-side comparison, annotations, and practice history into one focused sports video workspace. Record in the app or choose videos from your device, then return to the exact moment you want to study without switching between multiple tools. Use it to understand timing, posture, balance, joint position, and the sequence of a movement. MotionTagger does not judge your technique automatically; it gives athletes and coaches precise controls for reviewing the video together and making their own observations. [ Start with the video you need ] Record a new practice session in portrait or landscape, or choose an existing clip from your device. You can review one video by itself or add a second video when you want to compare attempts, angles, or a reference movement. [ Record and mark ] Record practice without leaving the app. Add markers while filming whenever you notice a good attempt, a missed cue, or a moment you want to discuss. After recording, open a marker to jump directly back to that point instead of searching through the entire clip. [ Review precisely ] Use slow playback, frame stepping, timeline seeking, and loop ranges to inspect timing and body position in detail. Move a frame at a time around impact, release, landing, or another decisive moment. Repeat only the section you need until the movement becomes easier to understand. Double-tap the left or right side to jump 5 seconds. While a video is playing, hold it for temporary 2x speed and release to return to the previous playback speed. These gestures make it quicker to move between setup, action, and follow-through. [ Compare movements ] Place two videos side by side and align matching moments. Compare today’s attempt with an earlier session, your movement with a reference clip, or the same movement from front and side angles. Adjust the sync point so both videos reach the key moment together, then play or step through them while keeping the comparison aligned. [ Annotate and share ] Pause on a key frame and add freehand marks, straight lines, arrows, circles, or text notes. Use them to point out body angles, movement direction, alignment, space, or the next cue to remember. Save the annotated frame to your device or share it with a coach, teammate, athlete, or family member. A still image with a clear visual note can make feedback easier to understand than a long message. [ Keep practice organized ] Save videos, sync points, loop ranges, markers, and annotations as projects. Browse them in a list when you know which session you need, or use the calendar to review practice by date. Reopen a project to continue from the same comparison, loop, and notes instead of rebuilding the review each time. Projects are managed on your device. [ Useful across different activities ] MotionTagger can support detailed self-review and coaching in activities such as: - golf swings and putting strokes - baseball pitching, batting, and fielding - tennis serves and groundstrokes - running, jumping, and throwing drills - strength training, fitness, and mobility practice - dance, martial arts, and other technique-focused movement [ A simple review routine ] 1. Record a practice or choose a video. 2. Mark or seek to the movement you want to study. 3. Slow down, step frame by frame, or repeat a short range. 4. Add a second video and synchronize the key moment when comparison helps. 5. Draw or write what you notice, then save the project or share a still image. The free plan supports up to 10 saved projects. MotionTagger PREMIUM removes the saved-project limit. Recommended for athletes reviewing their own practice, coaches giving visual feedback, instructors explaining technique, and anyone who wants to turn recorded movement into a concrete next step.