You can use these files on a Mac computer and an iPhone in the GoodNotes 5 app. However, I recommend using my digital planners and notebooks primary on a tablet device with a stylus. This will give you an experience that is most similar to pen and paper and really maximizes the benefits of using this type of planner. I do refer back to my planner or add quick notes on both my iPhone and Mac computer as well, but I don't do the majority of my planning/note taking on these devices. With the GoodNotes 5 app, your notebooks/planners will sync across all Apple devices through your iCloud account. If you want to test a planner out on your specific device/app of choice, you can receive a free planner sample through my Intro to Digital Planning email series.I also have a video overview of GoodNotes 5 for Mac on this page.