Hip, knee, and ankle angles
Plot any joint through the whole rep and read the value at the bottom position.
Squat form analysis
See the depth and the angles, not just the rep.
A squat happens faster than you can watch it. ViSIn tracks the lifter on every frame and turns the clip into joint angles you can scrub through, so 'it felt shallow' becomes a number you can compare with next week's set.
No app install · short preview without signup · source video not retained
Numbers you can compare against your own clips.
Depth, measured the same way each time
The estimate is only comparable against your own clips at a similar camera position — which is exactly what progress tracking needs.
Left against right
A rear view estimates side-to-side differences that a side view cannot see.
How you film it decides what the numbers mean.
Place the camera perpendicular to the main movement plane, level with the hips, and keep the full body in frame from setup to lockout. A rear view adds the side-to-side comparison.
Estimates from a single camera are comparable when the setup is comparable. Note where you put the camera so the next clip can be shot the same way.
Straight answers, including the limits.
Will it tell me if my form is wrong?
No. It measures what your body did and shows it plainly. Deciding what should change is your call, or your coach's — the numbers are evidence, not a verdict.
Do I need a gym setup or special camera?
A phone propped steady is enough. Framing matters far more than camera quality: keep the whole body visible and the camera square to the movement.
Can I compare two sessions?
Yes. Open two clips side by side, and save analyses to review the same lift over time.
Other things you can measure this way.
Record one clip and see what it gives you.
The preview runs without an account. Save an analysis when you want to compare it with the next one.