What are some alternatives?
When comparing Pearltrees and Substack, you can also consider the following products
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
TinyLetter - Start writing your own newsletter instantly.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Buttondown - Buttondown is the best way to start and run your newsletter
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Revue - The easiest way to create and send a curated newsletter