FormSight vs 3DSeg/JointAngles

FormSight is a coaching tool for personal trainers, strength coaches, and movement specialists. Record a client's set, see a live skeleton overlay with joint angles and rep-by-rep form grades, then review the session with frame-by-frame playback, annotation, and looping. WHAT IT DOES • Live skeleton overlay with joint angles during recording • Rep counting with green, yellow, and red form grades • Eight movement quality checks including knee valgus, hip shift, forward lean, and back rounding • Side-by-side comparison of two sessions • Frame-by-frame review with drawing, annotation, and looping • Per-client roster with session history, trend charts, and quality scores • Branded PDF reports for client check-ins • Still frame capture and video export to Photos • Fully on-device processing — no internet required, no account, no data leaves your device SUPPORTED EXERCISES Squat (front view and side view), Romanian deadlift, stiff-leg deadlift, and good morning. Each exercise activates the movement quality checks that apply to its pattern. SUBSCRIPTION FormSight Coach starts with a 14-day free trial. After the trial, continue at $9.99 per month or $99 per year. Subscriptions auto-renew through your Apple ID unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in Apple ID Settings. PRIVACY All client data, recordings, session notes, and PDF exports stay on your device. FormSight has no analytics, no account creation, and sends no data to a server. FormSight is a coaching and observation tool. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any injury, illness, or condition.

3D Seg/Joint Angles measures three-dimensional Cardan/Euler angles of body segments and joints using your iPhone's built-in motion sensors — no external hardware required. Designed for biomechanics researchers, clinicians, physiotherapists, athletic trainers, and students, the app uses your iPhone's accelerometer, gyroscope, and magnetometer to compute the three rotational angles (about the X, Y, and Z axes) that describe how a body segment or joint has moved from a defined starting position. HOW IT WORKS Place the iPhone on a body segment (e.g., thigh, shank, forearm). Press "Set Initial Position" to define the reference frame. The app then continuously reports the three angles — in degrees — that describe the 3D rotation from that starting position to the current position, in real time at 60 Hz. ROTATION SEQUENCES Six standard Cardan/Euler rotation sequences are supported: • X-Z-Y (default, recommended for most lower-limb joints) • X-Y-Z • Y-X-Z • Y-Z-X • Z-X-Y • Z-Y-X Select the sequence that matches your anatomical convention. Angles are always displayed in X, Y, Z order regardless of the sequence chosen. PHONE AXES • X axis — points to the right side of the phone (medial-lateral; flexion/extension) • Y axis — points toward the top of the phone (longitudinal; internal/external rotation) • Z axis — points out of the screen (anterior-posterior; abduction/adduction) Positive and negative angle signs follow the right-hand rule applied to each physical axis of the phone. RECORDING AND EXPORT Start and stop recording with a single tap. After recording, the three angles are plotted over time directly in the app. Export the data as a CSV file via email, AirDrop, or any share destination for further analysis in Excel, MATLAB, or R. KEY FEATURES • Real-time 3D angle display at 60 Hz • Six selectable Cardan/Euler rotation sequences • Calibrate to any starting position • Built-in angle time-series plot • CSV export via iOS Share Sheet • Works completely offline — no internet required • No account or login needed • All data stays on your device IMPORTANT NOTES • For accurate results, hold the phone still during calibration • The Z axis requires the magnetometer to be valid — keep the phone away from strong magnetic fields • This app is intended for research, education, and rehabilitation purposes. It is not a certified medical device.