Apps for digitally planning?

To use a digital planner, you will need a separate PDF annotation app.

My favorite app on the iPad is Goodnotes. On the iPad other apps include Notability and Collanote.

A recommended app for Android is Penly. You can create custom hyperlinks and batch import stickers, and there’s even some undated digital planners included within the app so there is no need to purchase a separate digital planner.