SwingVantage is a web app that reads a phone video of your swing, picks the one change most worth working on first, gives you a practice plan for it, and then helps you retest to see whether it changed.
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It covers 7 sports — golf, tennis, pickleball, padel, baseball, slow-pitch softball and fast-pitch softball. The analysis workspace is Motion Lab: you record or upload a clip, it tracks your body on your own device, checks whether the footage is good enough to support a read, and shows what it found with a confidence level and a label saying whether each number was measured, estimated or inferred.
Everything is organised around one loop — one fix, one plan, one retest — so you always know the single next thing to do instead of reading a list of twenty faults.