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Leaflet vs Substack: catalog facts
Leaflet	Substack
Free Custom themes and custom domains are offered free; no paid plans are listed on the…	Free Free to start a publication; writers can charge readers for subscriptions.
Web	Web
Publishes to email subscribers and Bluesky at once Free custom themes and custom domains	Newsletter, blog and podcast in one publication Built-in paid subscriptions
Web only Tied to the AT Protocol ecosystem	Hosted only, with limited design control Discovery and reading revolve around the Substack app and feed
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.