I bought this $99 app and the cheaper non 4K app. I can see no difference at all. I run it on an iPad Pro and and iPhone 6 Plus both seem to crash and I loose the entire recording. I cant get this to work on my corporate network and the 3G server option is not yet available and will probably cost a fortune. I have reverted to simply recording on my phones and then copying the files to iMovie or Camtasia where I have more stability and power. For me this app was a complete waste of money