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SendFox vs Substack

SendFox: Affordable email marketing for content creators. Substack: Writers making money doing the work they believe in. Same fact set for both, straight from each vendor's docs.

SendFox

Free tier
Free plan: 1,000 contacts, 3,000 sends/mo
Paid from
$29 one-time (Lifetime); Pro from $19/mo · pricing page
Public API
Yes docs
MCP server
No · No official or community MCP server found.
Best for
Affordable email marketing for content creators
Website
https://sendfox.com

Substack

Free tier
Free to publish, no subscriber cap
Paid from
No monthly fee; 10% of paid subscription revenue plus Stripe fees · pricing page
Public API
Yes docs
MCP server
Community · Community servers on GitHub only
Best for
Writers making money doing the work they believe in
Website
https://substack.com

Which one?

SendFox suits affordable email marketing for content creators. Substack suits writers making money doing the work they believe in. Pricing changes; the fact tables above link both vendors' live pricing pages. For the rest of the field, see SendFox alternatives, Substack alternatives, or the full table.