PowerChalk.com was a website that debuted in March of 2011. It's centerpiece was a browser based HD telestrator written in Flash. It was the world's first telestrator that ran completely in the browser.

Predating all manner of browser-based screen capture, the ChalkTalk Telestrator recorded voice with RTMP servers and recorded the screen by capturing all user markups and video frame advances to a log file. It used the logs to recreate the video session. Written by Chaz Henry it was first deployed by the Cincinnati Reds and the Los Angeles Dodgers on private sites. Both teams used it for three years until the advent of Trackman and Pitch f/x which MLB installed into all ballparks. At that point, it was licensed by Little League Baseball and used by thousands of teams and coaches.

Not specific to baseball, PowerChalk LLC licensed the ChalkTalk Telestrator to USA Diving, USA Baseball, Disney, USA Softball and more. Before being retired in 2021, the site collected a half million user uploads (mostly swings and pitches) and helped create remote lessons for eighty thousand users. In its final version, the site included split screen video markup and human pose keypoints generated with Machine Learning (via Meta Detectron2).