Substack

Substack provides a publishing platform for newsletters, podcasts, video, live streams and static pages. It includes a post editor, email delivery, subscriber management, paid subscriptions, and discovery features such as recommendations and Notes.

Its customers are independent writers, journalists, podcasters, video creators, and media companies that publish to their own audiences. The company states that writers keep 90% of their revenue minus credit card fees, and that it makes money only when creators do; the website also describes free-to-start pricing with no platform fees.

Substack was part of the Winter 2018 Y Combinator batch. Its website states a headquarters in San Francisco, offices in New York City and London, and a team of more than 150 people. It announced a $100M Series C in July 2025, backed by Andreessen Horowitz, BOND and The Chernin Group. Open roles listed on its careers page cover full stack engineering, sponsorships and brand partnerships, events, communications, people, business operations, data and standards and enforcement.

Product: A publishing platform for newsletters, podcasts, video, live streams and pages, with built-in paid subscriptions, email delivery and recommendation-based discovery.