Substack writers often need more than one link: the publication, a best essay, a book, speaking, or socials. Profile fields are short, so a link in bio page carries the rest.
Readers who like newsletters usually prefer clarity. A text-first page with a few clear links feels more honest than a crowded creator stack.
1kb.bio works well as a link in bio for Substack. Point people to your Substack home, a sample post, and whatever else you want found — on a page that stays out of the way.
See a sample substack writer link in bio page — with a profile photo and the same simple layout you get on 1kb.bio.