Substack Reader is a free Android app developed by Substack Inc. that allows users to collect and read newsletters in a dedicated inbox. The app's main goal is to provide an easy and efficient way to stay up-to-date with your favorite writers and discover new ones on the Substack platform.

With Substack Reader, users can subscribe to their favorite writers and receive instant notifications when a new post is published. The app also offers a simple and elegant view to read posts, making it easy to focus on the content without any distractions.

The app's interface is user-friendly and easy to navigate, allowing users to discover new writers and subscribe to their newsletters with just a few taps. Overall, Substack Reader is a great app for anyone who wants to stay informed and up-to-date with their favorite writers on the Substack platform.