Do I need a separate purchase for the iPad, iPhone, and Mac?
The app is universal for iPad and iPhone, but not for Mac. If you want Story Planner on all your devices, you will have to purchase it separately for iOS and macOS.
The iOS App Store and the Mac App Store are different platforms. They require independent development for each version of the app, as well as maintenance and support. That is why our users have to purchase the app for Mac with a different price. We hope you understand.