Sofa

A thoughtfully designed, extremely customizable iPhone+iPad+Mac app for tracking things you want to read, watch, do, etc. (or are currently reading/watching/doing/etc.). A text note or spreadsheet will also do a perfectly serviceable job, of course, but I actually enjoy tracking things in this, and it has handy features like pulling data from JustWatch to show you where you can watch movies and TV shows that are on your list, and putting completed items into a logbook that then then gives you a searchable, filterable archive of everything you've read/watched/done/etc. (And if you want to track podcast listening in it and/or don’t already have a podcast player you’re happy with, it even has its own built-in podcast player now.) The website also has some helpful explainer videos to show all the different things you can do with it.