If you'd rather read about it than watch the video demo, I wrote a Medium article: https://medium.com/@baogorek/xcoach-a-chrome-extension-for-a...
Though it's completely free, I'm having trouble getting users. I'd really appreciate any ideas.
I'm also wondering whether it would make sense to create a "Coach" for other platforms on desktop as well. I learned that some people primarily use TikTok on desktop, which surprised me (well, one person, who is a creator).