About Substack
From the developer's description on Google Play.
Substack is a new media app that connects you with the creators, ideas, and communities you care about most.
+ Support the creators you love: Subscribe for free or upgrade to view original work and connect directly with your favorite writers, artists, and podcasters.
+ Enjoy ad-free videos and podcasts: Access short-form clips, video episodes, and read-aloud articles without interruptions.
+ Connect in real time: Join livestreams and live group chats, where top creators bring their biggest supporters into their world.
+ Explore independent ideas: Discover bold opinions and engaging views across food, sports, politics, fashion, comedy, finance, and more.
How it works: 1. Download the Substack app. 2. Claim your handle. 3. Explore the feed to enjoy notes, videos, and clips from creators. 4. Subscribe to your favorites for free, tune into their livestreams and join private group chats.