Is this like Substack?

Yes, the model is the same: free and paid subscribers, posts on the web and by email, you set the price. The differences: it lives on your own domain instead of a Substack address, it sits next to your episodes and search, and Podspun drafts posts from your transcripts and your audience's activity instead of leaving you with a blank page. If you already publish on Substack, you can also connect it to Podspun as a channel. If you are starting fresh, this is the newsletter, so you do not need a second platform.