Substack Reader is a free iPhone app developed by Substack Inc. that allows you to read your favorite newsletters in one place. The app is designed to help you stay up-to-date with the latest posts from your subscribed writers, and discover new ones on Substack.

With Substack Reader, you can collect your newsletters in a dedicated inbox and get instant notifications when a new post is published. The app provides a simple and elegant view for reading posts, making it easy to focus on the content. You can also save posts to read later and browse through your reading history.

Overall, Substack Reader is a great tool for anyone who loves to read newsletters and wants to keep up with their favorite writers. The app is user-friendly and provides a seamless reading experience. Download Substack Reader today and start enjoying your favorite newsletters in one place.