Any joint you choose
Plot the angle across the clip rather than reading one frame.
Joint angle measurement
Pick a joint. Get the angle on every frame.
Underneath every form check is the same operation: find the body points on each frame and compute an angle between them. ViSIn exposes that directly, so you are not limited to the movements someone else decided to support.
No app install · short preview without signup · source video not retained
Numbers you can compare against your own clips.
Frame-by-frame values
Scrub to a moment and read the number for that frame.
Two clips side by side
Compare a before and an after in the same view.
How you film it decides what the numbers mean.
Film perpendicular to the plane the movement happens in and keep the whole body visible. An angle measured from an oblique camera is measuring a projection, not the joint.
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.
What is being detected?
Body keypoints on each frame, from which angles between segments are computed. No markers or suit are needed.
How accurate is it?
It is an estimate from a single camera. It is most useful compared against your own clips shot the same way, and least useful as an absolute clinical figure.
Does my video get uploaded and kept?
The source video is not retained. See the privacy page for exactly what is stored.
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.