Disputed lines are the most common argument in amateur pickleball and tennis. This page gives you two things for free: an instant in/out call when you mark where the ball landed, and a scoreboard that keeps the tally your phone camera can't. No account, no app.
This is a 2D demonstration, not video analysis. You are drawing where the ball landed; the tool applies the in/out rule and keeps score. The thing we are actually building is different: you film one match on a single phone on a tripod, and it calls the lines, keeps score, and counts your shots automatically — the kind of data that used to require a coach. Nobody has that for pickleball yet, and that is exactly what we want to know about.
Leave a way to reach you and tell us which match you would film first (league night? a tournament? practicing serves?). If there is enough interest we will invite the first group to film a match and get the full analysis free — in exchange for telling us whether the numbers were actually useful.