How to Analyze Your Swing on Your Phone
From https://v1sports.com/athletes/v1-golf-app/ :
The free V1 Golf Swing Analysis and Instruction App empowers golfers to be their best. Capture and review your swings with powerful analysis and playback tools. Our golf swing app also allows you to connect with one of thousands of instructors who teach with V1 Sports. Send videos and receive voice-over video lessons by connecting with one of thousands of V1 Pro instructors who teach with us through the app.