Substack is an online platform that provides publishing, payment, analytics, and design infrastructure to support subscription newsletters. It is designed to serve as a resource for people wanting to start a subscription newsletter, and it makes it easy to monetize newsletters by setting up a payment system and providing easy ways to track analytics. The Substack app is an iOS app for reading that brings all Substack subscriptions together in one venue, like an email inbox, but better. It offers a quiet space to read, where the work itself is given the spotlight and readers are not pulled into status games or trivial diversions. The app helps bring together Substack as an ecosystem, giving readers an icon to tap on their home screen that opens up a treasury of quality work by the writers they most trust. The app also includes subscriber-only chats, where readers can chat with the writers of their favorite publications. Substack is home to thousands of independent writers, creators, and journalists, and it allows writers to send digital newsletters directly to subscribers.