Is There a Mobile App?
There's no separate iOS or Android app, and you don't need one. The entire course is a responsive web app, so it works just as well on your phone or tablet as it does on a computer.
Just open course.options.cafe in your mobile browser and log in. Videos, progress tracking, and slide downloads all work on mobile.
Tip: add the site to your home screen for one-tap access — most phones let you do this from the browser's share or menu button. Your progress syncs to your account, so you can start a lesson on your phone and finish it on your laptop.