ConvertKit

ConvertKit is an email marketing platform built specifically for creators — writers, course sellers and independent publishers rather than retail brands.

Its model is tag-based rather than list-based: a subscriber exists once and carries tags describing their interests and actions, which avoids the duplicate-across-lists problem that makes traditional email tools awkward for creators.

It includes landing pages, forms and simple automations, and its pricing scales with subscriber count rather than with send volume.