Cadence and contact timing
Estimated steps per minute and left-right ground-contact time.
Gait analysis
A gait baseline you can repeat whenever you want.
Lab gait analysis gives you one very good snapshot on one day. The value of doing it from your phone is repetition: the same measurements, at the same pace and camera placement, often enough to see whether anything actually changed.
No app install · short preview without signup · source video not retained
Numbers you can compare against your own clips.
Vertical motion
Expressed against your height, so it means something across clips.
Symmetry
A rear view adds pelvic and step-width estimates a side view cannot give.
How you film it decides what the numbers mean.
Side view: film level with the hips and include several full strides. Add a rear view to review pelvic and step-width estimates.
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.
Is this as accurate as a lab?
No, and it is not trying to be. These are estimates from video. Their value is that you can repeat them under the same conditions and watch the trend.
Is there a correct cadence?
Treat cadence as a same-pace baseline for you, not a universal score. Comparing your own clips at similar pace is the useful comparison.
Treadmill or outdoors?
Either works. A treadmill makes it easier to hold pace and camera placement steady, which makes clips more comparable.
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.