Gumroad vs. Substack — What's the Difference?

Gumroad is an online platform that facilitates the sale of products by creators directly to consumers. Sahil Lavingia founded the company in 2011 with the intention of making selling as easy as social sharing.

Substack is an online platform that provides publishing, payment, analytics, and design infrastructure to support subscription newsletters. It allows writers to send digital newsletters directly to subscribers.Founded in 2017, Substack is headquartered in San Francisco, California.

(maths) A subset of a stack