Best personal training app (for trainers)

My girl has been using Facebook private groups for her personal training clients. She posts the monthly workouts, everyone follows along there. She has a lot of people on there now, and wants to transition to a personal training app, one where she can post her workouts, add video exercise demo’s, and people can track their training right on there. That kind of deal. 

 

So many of these apps to choose from. True Coach, Trainerize, Train Heroic, etc. 

 

anyone have any experience with these apps. Maybe give a recommendation on which one she should use, and why. 

 

thanks