> But what are the things the app can do that the web cannot?
As a subscriber to many Substack newsletters with different publishing schedules, I've found it to be a bit tedious and distracting to have my email inbox be inundated with new posts. I'd rather go to a reader app that has all the newsletters I've subscribed to in one place for when I have the time and the interest to spend a couple of hours reading. I'd like for the app to just send me a reminder once a week with who published what so that I can decide if I want to go to the reader app and peruse at my leisure.
As a writer on Substack I've found that readers like to reply directly to the emails they receive instead of leaving a comment on the web version so that others could see it and perhaps react/interact with it. If the app could help harness a community for the writers by making it more comfortable for readers to like and leave comments, then that would be beneficial in building a brand. Additionally, if the app has a mechanism to recommend Substack newsletters that are similar to the one a particular reader is reading then that would help expand the reach/discoverability of lesser known writers.