Substack is an email newsletter platform designed for small publishers hoping to turn their subscribers into paying customers.

When you start a Substack, you get:

1. Your own email list
2. A website for all your posts
3. Community features
4. An email marketing system to promote your content to your subscribers
5. Control over what’s free and what’s only for your paying subscribers

Substack is free to use if you don't charge for your newsletter — no limit on the number of subscribers. For a paid newsletter, Substack takes 10% of your subscription revenue, plus Stripe fees.