Personalized Digital Notebook, Custom 12 Subjects Digital Notepad, Blank Notebook Journal, Goodnotes Android iPad Planner, Hyperlinked TabsThis digital notebook is PDF files that work with any PDF annotation apps. Also, the hyperlinked tabs completely function on GoodNotes, Notability, or Noteshelf (or other apps that supported).What's Inside The Notebook:- A digital notebook that can create up to 12 sections by yourself- Unlimited duplicate the blank page with up to 6 paper styles and 2 themes