Kit (formerly ConvertKit) vs Substack

Kit gives you full control over your email infrastructure with automations and tagging. Substack gives you a free publishing platform with built-in discovery but takes 10% of paid revenue. The classic own-vs-rent debate.

Verdict

Start on Substack if you're building from zero — the discovery network and zero upfront cost are unbeatable for launching. Move to Kit (or beehiiv) once you're earning enough that 10% revenue share hurts. Substack is the on-ramp; Kit is the highway.