JotPlan app for iPhone and iPad

The most user-friendly scheduler might just be a printed Letter-size sheet with a months worth of appointments. On paper, youre not confined to grids—you can write whats most important in a big way and fit plenty of smaller details. It provides an overview at a glance, and you can fold it up to take it with you. And if you flip it over, it doubles as a notepad.

If you have an iPad and an Apple Pencil, you can do the same with JotPlan:

Your standard calendar appointments are displayed on the schedule. (You can also edit and add new ones.)
It follows a one-day-per-line format, so you have plenty of horizontal space to jot down anything you need on a digital Letter-sized canvas. (And if you cant fit it all, theres a notepad on the back screen.)
You can view the entire schedule in portrait mode on the iPad and zoom in on landscape mode.
What you write on the iPad can be checked anywhere using an iPhone.