Substack operates a subscription-based publishing platform designed to help creators earn money from newsletter subscriptions. It provides tools for text, video, and audio content, allowing creators to send posts directly to subscribers' inboxes without ads, fostering better client relations. This enables users to launch an email newsletter and publish content seamlessly.

Notable investors include:

Other investors include:

Cody Heisinger, TriplePoint Venture Growth BDC, ZhenFund, Micron Ventures, Triton Funds, VentureSouq, Wei Guo, Other People's Capital, Celesta Capital, Mark Pincus, Black Violet Capital, Nate Silver, Wisdom Ventures, CLF Partners, Niche Capital (San Francisco), Fifty Years, Emmett Shear, Omeed Malik, Collaborative Fund, GarageCapital, Xfund, Y Combinator, Brad Flora, Old Queen Street Media, Naval Ravikant.

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